UT333 - Mètre Uni-T - Free user manual and instructions

Product Type	Mini Temperature & Humidity Meter
Brand	Uni-T
Model	UT333
Measurement Range (Humidity)	0~100%RH
Measurement Range (Temperature)	-10~60°C (14~140°F)
Humidity Accuracy	±5%RH (at 23°C±5°C)
Temperature Accuracy	±1.0°C (at 40%RH~75%RH)
Resolution (Humidity)	0.1%RH
Resolution (Temperature)	0.1°C / 0.2°F
Sampling Rate	1 time per second
Display	4-digit LCD
Backlight	Yes, manually controlled
Data Hold	Yes
MAX/MIN Recording	Yes
Auto Power Off	After 5 minutes (can be disabled)
Low Battery Indication	Yes (battery icon)
Overload Indication	"OL" for temperature out of range, "100.0%RH" for humidity
Power Supply	3 × AAA 1.5V batteries
Dimensions	155 × 50 × 28 mm
Weight	102 g
Operating Environment	0°C to 40°C, ≤90%RH
Storage Environment	-20°C to 60°C, ≤75%RH
Safety Standards	EN61326-1, Pollution Degree 2
Sensor Type	High-accuracy digital temperature and humidity module
Maintenance	Clean with soft cloth and neutral detergent; do not use abrasive or solvent
Battery Replacement	User-replaceable (3xAAA)
Included Accessories	Main unit, operating manual

Frequently Asked Questions - UT333 Uni-T

How do I turn off auto power off?

Press and hold the HOLD key then press ON/OFF. The LCD will display APO OFF to indicate auto power off is disabled.

What does 'OL' mean on the display?

OL stands for overload. It appears when the temperature is below -20°C or above 60°C, indicating the reading is out of range.

How do I switch between Celsius and Fahrenheit?

Press the °C/°F key briefly during measurement to toggle between Celsius and Fahrenheit units.

How do I replace the battery?

Turn the meter over, push the battery cover in the direction of the arrow, lift it, and remove old batteries. Insert three new AAA 1.5V batteries following polarity marks, then close the cover securely.

What is the accuracy of temperature and humidity measurements?

Humidity accuracy is ±5%RH at 23°C±5°C. Temperature accuracy is ±1.0°C (±2.0°F) at 40%RH~75%RH.

How should I clean the meter?

Use a soft cloth dampened with a neutral detergent. Do not use abrasives or solvents as they may damage the case.

Can I use the UT333 outdoors?

The meter is designed for indoor use only. Operating temperature is 0°C to 40°C with humidity ≤90%RH.

How does the MAX/MIN function work?

Press the MAX/MIN key to cycle through maximum, minimum, and current readings. The display shows MAX or MIN accordingly.

How do I turn on the backlight?

Long press the HOLD/BL key to turn the backlight on or off.

What are the measurement ranges of the UT333?

Humidity: 0~100%RH. Temperature: -10~60°C (14~140°F).

USER MANUAL UT333 Uni-T

Mini Temperature & Humidity Meters Operating Instruction

1. Introduction

UT 333 is a stable, safe, reliable mini digital temperature humidity meter, which is widely used in grain storage and transportation, file management, material management, forestry and animal husbandry, health care, teaching experiment, public sector, home, and others. This operating manual includes relevant safety information and warnings. Please read this manual carefully and observe all the cautions strictly.

Warning:

Before using the product, please read the operation safety rules carefully.

2. Out of Box Checking

Open the packing box and take out the meter. Please check carefully if items are missing or damaged.

1. Main unit ____ 1
2. Operating manual—1

3.Operation Safety

1. Please check the meter and the accessories before using and beware of any damage or abnormal phenomenon. If you find the case is damaged or the LCD shows nothing, or you consider that the meter could not work properly anymore, please stop using it.
2. Observe the operating instructions while measuring.
3. Do not open the meter at will or change internal wiring to avoid damages to the mater.
4. When the LCD displays "☐", replace the battery timely. Remove the battery if the meter is not used for a long time.
5. Do not store or use the meter in high temperature, high humidity, flammable, combustible, or strong electromagnetic environment.
6. Please use soft cloth and neutral detergent to clean the case for maintenance. Do not use grinding agent and solvent to avoid case corrosion and damaging the meter.

4.Product Outlook

1. Temperature and humidity sensing module
2. Meter case
3. LCD display
4. Function keys
5. Display Interface

5. Display Interface

1	Maximum measurement	5	Relative humidity
2	Minimum measurement	6	Celsius
3	Data hold	7	Fahrenheit
4	Low battery	8	Temperature value
9	Humidity value

6. Key Functions and Setup

1. ON/OFF:

Short press once to start up; short press again to power off.

Note: Product's auto power off feature can be disabled: Press and hold "HOLD" and then press "ON/OFF" key to enable/disable auto power off, LCD will display "APO OFF" to indicate status.

2. ℃/°F:

Unit conversion key: Short press this key to select Celsius or Fahrenheit at the time of measuring.

3. MAX/MIN:

Pressing this key can select maximum, minimum or normal value measurement; select maximum and the meter will always show the maximum reading; select minimum and the meter will show minimum reading.

4. HOLD/BL:

HOLD: Short press this key once to hold the measurement; short press this key again to exit data hold and continue normal measurement.

BL: Long press this key to turn on backlight; long press this key again to turn off backlight.

7.Technical Specification

1. Temperature and Humidity

Function	Range	Resolution	Accuracy	Description
Humidity	0~100.0%RH	0.1%RH	±5%RH	Under normal temperature condition (23°C ±5°C)
Temperature	-10~60°C	0.1°C	±1.0°C	Under normal humidity condition(40%RH~75%RH)
	14~140°F	0.2°F	±2.0°F
Sampling Rate			1/s	Sampling rate is once per second.
Overload Indication			100%RH/OL	Maximum displayed humidity is 100%RH; if the temperature is lower than 20°C or higher than 60°C, “OL” will be displayed
MAX/MIN Measurement			MAX/MIN	Shows “MAX/MIN”
Data Hold			HOLD	Shows “HOLD”
Unit			°C/°F	Shows “°C/°F”
Backlight			BL	Manually turn on or off backlight
Auto Power Off			5mins	Automatically power off after 5mins without operating; function can be turned off
Low Battery			3.0~3.5V	Shows low battery prompt when power is 3.0~3.5V

2. General Type

a. LCD: 4 digit LCD display

b. Overload indication: When humidity is greater than 99.99%RH, "100.0%RH" will be displayed; when temperature is greater than 60°C or lower than -20°C, "OL" will be displayed.

c. Low battery indication: Prompt "☐". The new battery should be replaced in time.

d. Sampling rate: 1/s

e. Sensor type: High-accuracy digital temperature and humidity module.

f. Impact strength: Can withstand the impact of landing from 1 meter's height.

g. Power requirement: 1.5V batteries (AAA) ×3

h. Product size: 155×50×28mm

i. Weight: 102g

3. Environment Specification

a. Indoor use

b. Altitude height: 2000m

c. Safety: EN61326-1

d. Pollution level: 2

e. Working temperature and humidity: 0°C\~40°C (not greater than 90%RH)

f. Storage temperature and humidity: -20°C\~60°C (not greater than 75%RH)

4. Electrical Specifications

a. Accuracy: humidity: ±5%RH (normal temperature condition) temperature: ±1.0°C (normal temperature condition)

b. Environment temperature: 23°C ±3°C

c. Environment humidity: ≤90%RH

1. General Maintenance Warning: please do not open the case of meter to avoid affecting device accuracy or damage to the meter.

a. Maintenance and service of the meter should be accomplished by professional personnel or designated maintenance department.

b. Clean the case by dry cloth periodically, but detergent with abrasive or solvent composition shall not be used.

6. Battery Installation and Replacement

a. The meter uses 3 pieces of AAA 1.5V batteries. Please see figure below for steps of battery installation and replacement.

b. Turn the panel down, push the battery cover open in the direction of the arrow, lift the cover and remove the batteries; install new batteries in accordance of polarity indications.

c. Please use batteries of same type instead of improper ones.

d. Close the cover tightly after installing new batteries.

Three-step diagram showing a mobile phone adapter with a red arrow indicating rotation (no text or symbols)

UNI-T®

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

No6, Gong Ye Bei 1st Road,

Songshan Lake National High-Tech Industrial

Development Zone, Dongguan City,

Guangdong Province, China

Tel: [phone]

http://www.uni-trend.com