UT343E - Mètre Uni-T - Free user manual and instructions

Product Type	Coating Thickness Gauge
Brand	Uni-T
Model	UT343E
Measurement Range	0–2000 µm (0–78.7 mil)
Resolution	0.1 µm (0–99.9 µm), 1 µm (100–2000 µm); 0.01 mil (0–4.99 mil), 0.1 mil (5.0–78.7 mil)
Accuracy	±(2% of reading + 2) µm; ±(2% of reading + 0.08) mil
Measurement Principles	Magnetic induction (Fe) and eddy current (NFe)
Matrix Identification	Automatic or manual (Fe/NFe)
Display	2" color TFT, auto-rotatable (0°, 90°, 180°, 270°)
Data Storage	3300 data points (55 groups × 60)
Communication	Bluetooth APP and USB (PC software)
Audio/Visual Alarms	Buzzer, voice broadcast, 3-color LED (green: pass, red: below limit, yellow: above limit)
Calibration	Zero-point and two-point calibration
Quick Test Mode	Single-point and multi-point PASS/FAIL
Flashlight	High-power LED flashlight
Power Supply	3.7 V 1300 mAh rechargeable lithium battery (4.81 Wh), USB charging
Battery Life Indication	Low battery indication at 3.4 V ± 0.2 V, auto power-off after 5 min
Dimensions (H×W×D)	152 × 65 × 35 mm
Weight	Approx. 180 g (including battery)
Operating Environment	0 °C to 40 °C, ≤80% RH
Storage Environment	−20 °C to 60 °C, ≤75% RH
Safety Precautions	Keep sensor clean; avoid high temperature, humidity, flammable, explosive, strong magnetic fields; do not disassemble; use original USB cable; do not look directly at flashlight
Maintenance	Clean casing with soft cloth and mild detergent; do not use abrasives or solvents
Included Accessories	Gauge, user manual, 6 standard coating thickness sheets, ferrous matrix, non-ferrous matrix, sensor protective cover, hand strap, USB cable
Warranty	1 year against defects in material and workmanship

Frequently Asked Questions - UT343E Uni-T

How do I calibrate the UT343E coating thickness gauge?

Calibration can be done in two ways: zero-point calibration (place sensor on an uncoated metal matrix) and two-point calibration (use a standard coating thickness sheet on an uncoated matrix). Access the calibration mode by long pressing the menu button in the main interface. For precise measurements, two-point calibration is recommended.

How do I change the unit from μm to mil?

Go to the menu by short pressing the confirm/menu button. Scroll to the 'Length Unit' icon (μm/mil), short press to enter, then use the up/down buttons to select μm or mil. Confirm by short pressing the menu button again.

How do I use the Bluetooth function?

In the menu, select the Bluetooth icon (✗) and turn it on. Download the Uni-T APP from the official website or app store. Ensure the distance between gauge and mobile device is less than 10 meters with no obstacles. The Bluetooth turns off automatically after 5 minutes of no connection to save battery.

What does the LED alarm indicate?

When the measured value is within the set upper and lower limits, the LED flashes green (PASS). If the value is above the upper limit, it flashes yellow. If below the lower limit, it flashes red. The LED alarm can be enabled/disabled in the menu.

How do I clean the UT343E?

Clean the gauge casing with a soft cloth and mild detergent. Do not use abrasives or solvents. Keep the sensor clean and free from dust and oil to maintain measurement accuracy.

How do I turn on the flashlight?

In the main interface, short press the power/flashlight button (☑) once to toggle the high-power LED flashlight on or off. The flashlight is located at the rear of the gauge.

How do I use the quick test mode?

Long press the menu button () to enter quick test mode. You can choose single-point or multi-point mode. Set a target thickness and tolerance. The gauge will display PASS or FAIL based on the measurement. Multi-point mode averages three measurements per point across five points (A-E).

What should I do if the display shows 'OL'?

'OL' indicates the measured coating thickness exceeds the gauge's range of 2000 μm. If the value exceeds 2200 μm, the gauge will not respond. Ensure the coating is within the measurable range.

How do I restore factory settings?

In the menu, scroll to the 'Restore factory settings' icon (Ⓧ), short press to enter, select 'ON', and confirm. This clears all stored data and resets calibration and settings. Use this if the gauge becomes inaccurate after multiple calibration errors.

How do I turn off auto power-off?

The UT343E has a fixed auto power-off time of 5 minutes to save battery. This cannot be disabled. To keep the gauge on, you need to interact (e.g., take a measurement) before the timeout.

USER MANUAL UT343E Uni-T

Abstract geometric pattern composed of gray squares and a central square (no text or symbols)

P/N:110401110803X

UNI-T®

UT343E Coating Thickness Gauge

PREFACE

Thank you for purchasing the new UT343E coating thickness gauge. In order to use this product safely and correctly, please read this manual thoroughly, especially the Safety Instructions part. After reading this manual, it is recommended to keep the manual at an easily accessible place, preferably close to the device, for future reference.

LIMITED WARRANTY AND LIABILITY

Uni-Trend guarantees that the product is free from any defect in material and workmanship within one year from the purchase date. This warranty does not apply to damages caused by accident, negligence, misuse, modification, contamination and improper handling. The dealer shall not be entitled to give any other warranty on behalf of Uni-Trend. If you need warranty service within the warranty period, please contact your seller directly. This warranty is the only compensation you can obtain. Uni-Trend will not be responsible for any special, indirect, incidental or subsequent damage or loss caused by any reason or speculation. As some areas or countries do not allow limitations on implied warranties and incidental or subsequent damage, the above limitation of liability and stipulation may not apply to you.

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UT343E User Manual

Table of Contents

1. Overview 4
2. Accessories 6
3. Safety Instructions 7

4. Function Description 8
   4.1 Product Structure 8
   4.2 Display Interface 9

5. Operating Instructions 12

5.1 Power on/off 12

5.2 Measurement 12

5.3 Menu 13

5.4 Calculated Values 17

5.5 Quick Test Mode 17

5.6 Calibration 18

5.7 Flashlight 21

5.8 Bluetooth APP 21

5.9 Upper Computer Software 21

1. Performance Indexes 22

6.1 Technical Indexes 22

6.2 General Specifications 24

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1. Overview

UT343E is an upgraded high-performance coating thickness gauge that can measure coating thickness on both ferrous and non-ferrous matrixes. This device has features of high precision, stable and reliable performance and non-destructive measurement, etc. It has functions such as automobile mode, voice broadcast, Bluetooth APP, LED flashlight. It is a necessary device for automobile manufacturing, sales, evaluation, metal processing, painting, inspection and other industries. It is widely used in manufacturing, metal processing, aeronautics and space, shipping, bullet trains, scientific research, quality supervision, and other fields.

The product is based on the principles of electromagnetic induction and eddy current measurement. The principle of electromagnetic induction measurement is to measure the coating thickness according to the size of the magnetic flux flowing from the sensor through the non-ferrous magnetic coating into the ferromagnetic matrix. The symbol is Fe. It can measure non-conductive or conductive coatings on magnetically permeable metals such as iron and steel (for example: galvanized steel sheet).

The principle of eddy current measurement is to measure the coating thickness according to the difference in the eddy current formed by an AC magnetic field on a non-magnetic metal matrix (such as aluminum). The symbol is NFe. It can measure non-conductive coatings on non-magnetic metal materials such as aluminum and copper. The matrix must be metal, and the coating cannot conduct electricity.

Features:

1. The measurement method conforms to GB/T 4956 non-magnetic coatings on magnetic matrixes-measurement of coating thickness-magnetic method.
2. The measurement method conforms to GB/T 4957 non-conductive coatings on non-magnetic basis metals-measurement of coating thickness-eddy current.
3. It has two thickness measurement methods: magnetic and eddy current.

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UT343E User Manual

1. It can automatically or manually identify the ferrous or non-ferrous matrixes.
2. Automatic voice broadcast of measured values
3. Bluetooth APP communication and application
4. It has a range of 2000μm.
5. The sensor adopts diamond embedded technology, which has the characteristics of precision, wear resistance and stability.
6. Single and two-point calibration methods are adopted to correct the sensor systematic error and ensure the measurement accuracy.
7. Single point/multi-point quick test mode ("PASS" or "FAIL")
8. 3-color warning light indicates the current value attribute (green: qualified; red: below the limit; yellow: above the limit).
9. The screen can be automatically rotated or manually locked, which is convenient for users to read the measured values from different angles.
10. The high-capacity memory chip can store 3300 data.
11. USB communication software: Communicate with the upper computer via USB to export stored data, draw trend graphs, take real-time measurements, and print.
12. High power LED flashlight
13. 3.7V 4.81Wh rechargeable lithium battery

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2. Accessories

Open the packing box and take out the gauge. Please double check whether the following accessories are missing or damaged.

1. Coating thickness gauge----1 pc
2. User manual----1 pc
3. Standard coating thickness sheets----1 set (6 pcs)
4. Ferrous matrix 1 pc
5. Non-ferrous matrix 1 pc
6. Sensor protective cover----1 pc
7. Hand strap----1 pc
8. USB cable----1 pc
9. 3.7V 4.81Wh rechargeable lithium battery----1 pc

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UT343E User Manual

3. Safety Instructions

1. Initialization self-test is needed for the gauge when it is powered on. When turning on the gauge, please do not put the sensor close to any metal objects, otherwise the gauge will be unusable.
2. Please keep the sensor clean and in good condition to avoid dust, oil and other factors affecting the measurement accuracy.
3. Do not use or store the gauge in high temperature, high humidity, flammable, explosive and strong magnetic field environments.
4. Clean the gauge casing with a soft cloth and mild detergent. Do not use abrasives or solvents to avoid damage to the gauge.
5. Do not disassemble or modify the gauge.
6. When the LCD displays the low battery symbol "☐", charge the product in time.
7. In order to prevent fire, when using the USB interface for charging or data communication, please use the original USB cable and disconnect it in time after use.
8. Do not irradiate the flashlight at eyes.
9. When using the Bluetooth communication function, the distance between the host and the mobile terminal device should be less than 10 meters and there should be no obstacles or metal shielding objects in between.
10. The standard coating thickness sheets are high-precision accessories that are related to the accuracy of the gauge and need to be preserved properly to prevent scratches, corrosion, bending and deformation of the surface.
11. The metal matrixes also need to be preserved properly to prevent scratches, rust, oxidation and deformation of the surface.
12. If other failures occur, select "Restore factory settings" in the menu.

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4. Function Description

4.1 Product Structure

1. LED alarming light
2. LCD
3. Power/flashlight
4. Confirm/menu
5. Cancel / delete
6. Add/histogram
7. Sensor module
8. Hand strap buckle
9. USB/charging interface
10. Flashlight

11. Loudspeaker

12. Subtract/automobile mode

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UT343E User Manual

4.2 Display Interface

4.2.1 Menu Icons

	Auto rotate screen	μm/mil	Units	Mode	Probe modes
Group	Storage location		Measurement modes		Upper limit
	Lower limit		LED alarm		Voice broadcast
	Calibration modes		Languages		Buzzer
	Backlight brightness		Bluetooth communication		Restore factory settings

Note: When the icon color becomes white, users can adjust the setting items. When the icon is brown, users can only browse the setting items.

4.2.2 Main Interface

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4.2.3 Single Point

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UT343E User Manual

4.2.4 Multi-Point

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5. Operating Instructions

5.1 Power on/off

Long press ☐ to turn on/off the gauge.

5.2 Measurement

Note: Keep the probe away from metal objects before turning on the product.
1. Long press 📄 to power on. It will enter the main interface after initialization;
2. If the product has not been used for a long time or the operating environment has changed, a two-point calibration is required before use;
3. First, press the probe vertically on the object to be measured, and the value displayed on the LCD at this time is the estimated value of the coating thickness;
4. Refer to this estimated value, and select a standard coating thickness sheet closest to this value from the accessories to prepare for two-point calibration;
5. A matrix with thickness or material close to the measured object and without coating should be selected as the calibration matrix as far as possible. When the above-mentioned matrix is not found, the standard matrix in the accessories can be selected as the calibration matrix (due to differences in material and thickness, the measurement results may be biased);
6. Please refer to the calibration chapter for the two-point calibration method;
7. After the two-point calibration is completed and verified repeatedly, the coating thickness of the object can be measured;
8. When measuring, select 3 to 5 measuring points on the surface of the measured object evenly, measure 5 times for each point, and take the average value of the 5 times as the indicating value of the point.
9. After the indicating values of the 3 to 5 measuring points are measured, the average of the values should be taken as the reference value of the object coating thickness.

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UT343E User Manual

Note:

1. Hold the gauge perpendicular to the object to be measured, and lightly press the gauge sensor against the object surface for measurement. It is necessary to keep the sensor in close contact with the object surface.
2. When the measured indicating value is greater than 2000μm, the screen displays OL to indicate over range.
3. When the measured indicating value is greater than 2200μm, the gauge will not respond.

5.3 Menu

In the main interface, short press 🔒 to open the menu:

5.3.1 Auto Rotate Screen

In the menu, press 🔒 or 🔒 to select the auto rotate screen icon Ⓞ, and then short press 🔒 to enter its setting interface. Press 🔒 or 🔒 to select to turn on/off the auto rotate function, and short press 🔒 to confirm or 🔒 to exit.

Note: The gauge has a built-in gravity sensor, which is convenient for users to read the screen content from multiple angles (0°, 90°, 180° and 270°). When the auto rotate function is turned off, the icon @ is displayed in the upper right corner of the screen.

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5.3.2 Length Unit

In the menu, press 📄 or 📋 to select the length unit icon μm/mil, and then short press 📋 to enter its setting interface. Press 📄 or 📋 to select μm or mil, and short press 📋 to confirm or 📋 to exit.

5.3.3 Probe Mode

In the menu, press 📄 or 📋 to select the probe mode icon Mode , and then short press 🔒 to enter its setting interface. Press 🔊 or 📋 to select automatic/ NFe/Fe mode, and short press 🔊 to confirm or 📋 to exit.

Automatic mode: In this mode, the matrix type of the measured object (Fe or NFe) can be automatically identified. The sensor will enter a corresponding operating mode according to the matrix type. Fe mode: The sensor will enter the electromagnetic induction operating mode. NFe mode: The sensor will enter the eddy current operating mode.

5.3.4 Data Storage Location

In the menu, press 🔒 or 🔒 to select the data storage location icon Group, and then short press 🔒 to enter its setting interface. Press 🔒 or 🔒 to select the group number, and short press 🔒 to confirm or 🔒 to exit. Note: There are 55 groups, and for each group, 60 data can be stored.

5.3.5 Continuous Measurement

In the menu, press or to select the continuous measurement icon, and then short press to enter its setting interface. Press or to select to turn on/off the continuous measurement mode, and short press to confirm or to exit.

Note: When this mode is turned on, the product will continue to measure until it is turned off.

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5.3.6 Upper Limit

In the menu, press 🔒 or 🔒 to select the upper limit icon ⬆, and then short press 🔒 to enter its setting interface. Short press 🔒 or 🔒 to add/subtract 1 to the single digit of the upper limit, and long press to add/subtract 1 to the tens digit. Short press 🔒 to confirm or 🔒 to exit.

Note: When the measured value is higher than the upper limit and the LED alarm is turned on, the LED light flashes yellow.

5.3.7 Lower Limit

In the menu, press 📄 or 📋 to select the lower limit icon ↓, and then short press 🔒 to enter its setting interface. Short press 🔒 or 🔒 to add/subtract 1 to the single digit of the lower limit, and long press to add/subtract 1 to the tens digit. Short press 🔒 to confirm or 🔒 to exit.

Note: When the measured value is lower than the lower limit and the LED alarm is turned on, the LED light flashes red.

When the measured value is between the upper limit and the lower limit and the LED alarm is turned on, the LED light flashes green.

5.3.8 LED Alarm

In the menu, press 🔒 or 🔒 to select the LED alarm icon 🔒, and then short press 🔒 to enter its setting interface. Press 🔒 or 🔒 to select to turn on/off the LED alarm, and short press 🔒 to confirm or 🔒 to exit.

5.3.9 Voice Broadcast

In the menu, press 🔒 or 🔒 to select the voice broadcast icon Ⓧ, and then short press 🔒 to enter its setting interface. Press 🔒 or 🔒 to select to turn on/off the voice broadcast function, and short press 🔒 to confirm or 🔒 to exit.

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5.3.10 Calibration Mode

In the menu, press 📄 or 📋 to select the calibration mode icon ⏻, and then short press 🔒 to enter its setting interface. Press 🔊 or 🔒 to select a calibration mode (single or two-point), and short press 🔒 to confirm or 🔔 to exit.

Note: The two-point calibration mode is more commonly used than the single-point mode.

5.3.11 Language

In the menu, press 🔒 or 🔒 to select the language selection icon ⚙️, and then short press 🔒 to enter its setting interface. Press 🔒 or 🔒 to select English or Chinese, and short press 🔒 to confirm or 🔒 to exit.

5.3.12 Buzzer

In the menu, press 🔔 or 🔔 to select the buzzer icon 🔔, and then short press 🔔 to enter its setting interface. Press 🔔 or 🔔 to select to turn on/off the buzzer, and short press 🔔 to confirm or 🔔 to exit. When this function is turned on and the gauge gets the measured value in the normal measurement mode, the buzzer will beep.

5.3.13 Backlight Brightness

In the menu, press 📄 or 📋 to select the backlight brightness icon ✉, and then short press 🔒 to enter its setting interface. Press 🔊 or 🔔 to adjust the brightness, and short press 🔒 to confirm or 📋 to exit.

5.3.14 Bluetooth

In the menu, press 📄 or 📋 to select the Bluetooth icon ✗, and then short press 🔒 to enter its setting interface. Press 🔊 or 🔒 to select to turn on/off the Bluetooth, and short press 🔔 to confirm or 🔒 to exit. Note: If there is no connection for 5 minutes, the Bluetooth function will be automatically turned off.

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5.3.15 Restore Factory Settings

In the menu, press 🔒 or 🔒 to select the restore factory settings icon Ⓧ, and then short press 🔒 to enter its setting interface. Press 🔒 or 🔒 to select to turn on/off the restore factory settings function, and short press 🔒 to confirm or 🔒 to exit.

5.4 Calculated Values

Four values will be automatically calculated and displayed at the top of the screen: Avg, Min, Max, Sdev. Long press 📋 for 2 seconds in the main interface to clear the current calculated values. Note: All the stored data will be cleared if users perform the above operation.

5.5 Quick Test Mode

In the main interface, long press 📄 to enter the quick test mode. Press 🔒 or 🔒 to select single point test or multi-point test, and short press 🔒 to confirm or 🔒 to exit. Note: The quick test mode is mainly used in the measurement of coating thickness of automobiles and other industrial products.

5.5.1 Single Point

a. Press ☑ or ☑ to set the target thickness value, and then press ☑ to confirm;
b. Press or to set the tolerance, and short press to enter the single point quick test mode;
c. Measure the coating thickness of the measured object;
d. The screen will immediately display the measured value and the test result ("PASS" or "FAIL");
e. Short press 🔒 to return or long press 🔒 to exit the single point quick test mode.

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UT343E User Manual

5.5.2 Multi-Point

a. Press 🧑 or 🧑 to set the target thickness value, and then press 🔒 to confirm;
b. Press ☐ or ☑ to set the tolerance, and short press ☐ to enter the multi-point quick test mode;
c. Measure the coating thickness of the measured object. Take 3 measurements near the same position and the gauge will calculate the average of the 3 times as the value of point A;
d. Change a position and take 3 measurements near the new position. The gauge will calculate the average of the 3 times as the value of point B;
e. The measurement methods of points C, D and E are the same as above:
f. After the measurement is completed, the screen immediately displays the average value of these 5 points and the test result ("PASS" or "FAIL"):
g. Short press 📄 to return or long press 📄 to exit the multi-point quick test mode.

5.6 Calibration

In the main interface, long press to enter the selected calibration mode. Note: The selected calibration mode depends on the setting in chapter 5.3.10.

Calibration modes	Icons	Description
Zero-point calibration		Place the sensor on an uncoated metal matrix
Two-point calibration		The standard coating thickness sheet and uncoated matrix are stacked together for calibration, and more accurate measurement results can be got.

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UT343E User Manual

5.6.1 Zero-Point Calibration

a. Place the gauge vertically on the uncoated matrix, as shown in Figure 1;
b. Pick up the gauge after 2 seconds, the screen displays the value 0.0, as shown in Figure 2, and the gauge automatically returns to the main interface;
c. The zero-point calibration completed.

Figure 1

Figure 2

5.6.2 Two-Point Calibration

a. Stack the standard coating thickness sheet (take 500μm as an example) and uncoated matrix together for calibration, as shown in Figure 3:
b. Pick up the gauge after 2 seconds, and the measured value shows on the screen, as shown in Figure 4; c. Press or to adjust the measured value to make it the same as the thickness value of the standard coating thickness sheet, as shown in Figure 5;
d. Press to confirm or press to cancel the calibration;
e. Place the gauge vertically on the uncoated matrix, as shown in Figure 6;

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f. Pick up the gauge after 2 seconds, the screen displays the value 0.0, as shown in Figure 7, and the gauge automatically returns to the main interface;
g. The two-point calibration completed.

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

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UT343E User Manual

5.6.3 Calibration Verification

In the main interface, measure the thickness of the standard coating thickness sheet. The measured value should be within the error range of the nominal value of the standard coating thickness sheet. For example, if the nominal value is 100 m, the measured value should be within the specified range of the technical index, otherwise it needs to be recalibrated.

Note: If the gauge is inaccurate due to multiple incorrect calibration operations, select "Restore factory settings" in the menu.

5.7 Flashlight

In the main interface, short press ☑ once to turn on/off the flashlight in the rear of the gauge.

5.8 Bluetooth APP

Users can download the APP on Uni-Trend's official website or APP Store.

Note: Please refer to the application instruction to know how to use the APP.

5.9 Upper Computer Software

1. Refer to the installation instruction to download and install the upper computer software;

2. Connect the USB cable to the computer;

3. Via the USB interface, users can send real-time data or save the stored data to the computer and generate reports.

Note: Regarding the operation method of the upper computer software, users can open the user manual in the help option of the software interface for reference.

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UT343E User Manual

6. Performance Indexes

6.1 Technical Indexes

Function	Range	Thickness	Resolution	Accuracy	Description
Ferrous and non-ferrous matrixes measurement (Fe and NFe)	0~2000μm	0~99.9μm100~2000μm	0.1μm1μm	±(2%H+2)μm	1mil=25.4μm
	0~78.7mil	0~4.99mil	0.01mil	±(2%H+0.08)mil
		5.0~78.7mil	0.1mil
Bluetooth APP	System requirements
	Searching time			5min	If there is no connection for 5 minutes, the Bluetooth function will be automatically turned off.
	Transmission distance			≥10m
Probe measuring force	0.3~1.5N				Probe measuring force range
Display	Color display				2" color TFT screen
Auto rotatable screen	According to the built-in gravity sensor				4 directions:0°, 90°, 180° and 270°
Unit conversion	μm/mil				Metric/imperial unit conversion
LED alarm	The LED lights up in the corresponding color when the value exceeds the set range for alarm.

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UT343E User Manual

Audio alarm	When measuring, alarming and pressing buttons, there will be corresponding prompt sounds.	The buzzer must be turned on.
Limit setting	0~2000μm
Measurement modes	Single/continuous
Statistical measurement	MAX/MIN/AVG
Matrix identification modes	Auto/manual
Voice broadcast	Voice broadcast for measured values	The voice broadcast function must be turned on.
Flashlight	Easy to use in dark environments
USB communication	Upper computer communication	Export stored data via the upper computer
Data storage	3300 data (55 groups * 60)
Backlight brightness	5 levels
Auto power off	5 minutes
Low battery indication	Low battery indication at 3.4V±0.2V
Power	3.7V 1300mAh lithium battery
Operating environment	0~40°C ≤80%RH
Storage environment	-20~60°C ≤75%RH

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6.2 General Specifications

1. Display: 2" color TFT screen
2. Refresh rate: 0.5s
3. Sensor type: Large range composite sensor
4. Impact resistance: can withstand 1 meter drop
5. Power: 5VDC 1A power adapter (USB interface)
6. Product size: 152×65×35mm
7. Weight: about 180g (including battery)

UNI-T.

UNI-TREND TECHNOLOGY (CHINA) CO., LTD.

No. 6, Gong Ye Bei 1st Road,

Songshan Lake National High-Tech Industrial

Development Zone, Dongguan City, Guangdong Province, China

Guangdong Province, China