Q: How to access the settings mode on the Testo 830T1?

To access the settings mode on the Testo 830T1, the device must first be turned off . Here is the correct procedure: Procedure to access settings mode Press and hold the measurement button (main button) while the device is completely turned off The device will automatically switch to settings mode The device will automatically exit settings mode if no button is pressed for more than 3 seconds Use the buttons to navigate Up/Down arrows : adjust the values (lower and upper alarm limits) Measurement button : confirm your settings and return to display mode © (Copyright) button : set the emissivity (in infrared mode) Important point: If your device refuses to enter settings mode, check that the battery is not low - a depleted battery may prevent access to the settings. Replace the 9V battery if necessary.

Q: Does the SD slot of the Testo 175T2 accept the SD card directly or only an adapter?

The slot of the Testo 175T2 accepts the SD card directly , not an adapter. You insert the SD card itself into the slot located on the right side of the thermometer (after loosening the locking screw). Insertion and data copying process: Insert the SD card into the slot - the screen will display "Sd" or "Sd CArd" Press and hold the [GO] button for more than 2 seconds The screen displays "COPY" and the yellow LED lights up during the transfer At the end of the transfer, the green LED blinks twice and "OUT" appears Remove the SD card and insert it into a reader on your computer to access the files The SD card can store up to 1 million values, allowing for continuous recording over several weeks or months depending on the measurement interval you have set.

Q: What is the memory capacity of the Testo 175T2 and how long can I record the temperature?

The Testo 175T2 has a memory that can store up to 1 million measurement values , providing a very large recording capacity. The recording duration depends on the measurement frequency you set (ranging from 10 seconds to 24 hours). For example: For 3 hours of monitoring with readings every 10 seconds : 1,080 measurements (ample capacity) For 3 hours with readings every 1 minute : 180 measurements For several days or weeks: set a more spaced frequency (every 5, 15, 30 minutes, etc.) With 1 million available values, you can record measurements for weeks or months depending on the chosen interval. The battery life (up to 3 years with a 15-minute interval) will therefore not be your limitation for 3 hours of monitoring.

Question 1

Does the Testo 905i measure air flow?

Accepted Answer

No, the Testo 905i does not measure air flow. This device is a connected measuring probe specialized in only two parameters:

Temperature: range -20 to +70 °C (accuracy ±0.5 °C)
Relative humidity: range 0 to 100 %RH (accuracy ±2.5 %RH)

The Testo 905i operates exclusively via Bluetooth with the mobile app "Testo Smart Probes" (iOS/Android) and does not have an air flow sensor. If you need to measure air flow, you will need to look for another Testo model equipped with this function (for example, Testo thermoanemometers or flow meters).

Question 2

How to access the settings mode on the Testo 830T1?

Accepted Answer

To access the settings mode on the Testo 830T1, the device must first be turned off. Here is the correct procedure:

Procedure to access settings mode

Press and hold the measurement button (main button) while the device is completely turned off
The device will automatically switch to settings mode
The device will automatically exit settings mode if no button is pressed for more than 3 seconds

Use the buttons to navigate

Up/Down arrows: adjust the values (lower and upper alarm limits)
Measurement button: confirm your settings and return to display mode
© (Copyright) button: set the emissivity (in infrared mode)

Important point: If your device refuses to enter settings mode, check that the battery is not low - a depleted battery may prevent access to the settings. Replace the 9V battery if necessary.

Question 3

How to disable the acoustic beep/alarm of the Testo 830T1?

Accepted Answer

The Testo 830T1 has an acoustic and optical alarm for infrared measurements. According to the manual, you can enable or disable the full alarm function.

To control the acoustic alarm:

Access the device's setting mode
Use the arrow keys to set the lower alarm limit
Then set the upper alarm limit
Disable the alarm function via the settings menu

Note: The acoustic alarm only works during infrared measurements. It simultaneously produces a sound signal and a visual indication on the screen when the values exceed the configured limits.

Question 4

How many temperature measurements does the Testo 175T2 record every 15 or 30 seconds for 8 hours?

Accepted Answer

Here is the exact calculation for the Testo 175T2 with its official capabilities:

Recording every 15 seconds for 8 hours:

8 hours = 28,800 seconds
28,800 ÷ 15 = 1,920 measurements

Recording every 30 seconds for 8 hours:

8 hours = 28,800 seconds
28,800 ÷ 30 = 960 measurements

Good news: The Testo 175T2 has a memory capacity of 1 million values. Whether you record every 15 or 30 seconds over 8 hours, you will only use 1,920 or 960 measurements respectively. You have a very large margin and can repeat this cycle hundreds of times without saturating the memory.

To set this interval of 15 or 30 seconds, you configure it via the testo ComSoft software before starting the recording on the device. The flexible interval of the 175T2 ranges from 10 seconds to 24 hours.

Question 5

What happens if I set 8h of recording but only use 5h, does it turn off automatically?

Accepted Answer

No, the Testo 175T2 does not turn off automatically after a configured duration. The operation is different:

How recording works

Once you press the [GO] button for about 3 seconds, the device records continuously on its own until one of the stop criteria is met:

The memory is full: The device can store up to 1 million values. If you set a measurement interval (10 seconds to 24 hours), it records until the memory is full.
A programmed stop criterion: Via the testo ComSoft software, you can define a specific stop criterion (specific date/time, number of measurements, etc.) for the recording to automatically stop at that moment.

Your case: 8h configured but 5h actual

If you configure the device to record for a long duration but only use it for 5 hours:

There is no automatic stop after 5h - the device continues to record.
If you manually stop the measurement (pressing [GO]), the 5 hours of data are saved.
The device does not turn off: it enters sleep mode waiting for a new action.

The solution

For the device to stop automatically at a specific time, set a stop criterion by date/time in ComSoft before starting the recording. The device will stop exactly at the defined time, without manual intervention.

Question 6

Does the SD slot of the Testo 175T2 accept the SD card directly or only an adapter?

Accepted Answer

The slot of the Testo 175T2 accepts the SD card directly, not an adapter. You insert the SD card itself into the slot located on the right side of the thermometer (after loosening the locking screw).

Insertion and data copying process:

Insert the SD card into the slot - the screen will display "Sd" or "Sd CArd"
Press and hold the [GO] button for more than 2 seconds
The screen displays "COPY" and the yellow LED lights up during the transfer
At the end of the transfer, the green LED blinks twice and "OUT" appears
Remove the SD card and insert it into a reader on your computer to access the files

The SD card can store up to 1 million values, allowing for continuous recording over several weeks or months depending on the measurement interval you have set.

Question 7

How to use the Testo 175T2 in standalone recording mode without a computer?

Accepted Answer

The Testo 175T2 is designed to operate completely autonomously, without a computer connection during recording. Here’s how to start and use the standalone recording mode.

Starting standalone recording

Press and hold the [GO] button for about 3 seconds until Rec appears on the LCD screen
The device will then start recording automatically at the configured interval (10 seconds to 24 hours)
No connection to a computer is required for the recording to function

Battery life and storage capacity

The Testo 175T2 operates with 3 AAA alkaline batteries (or Energizer L92 if temperatures are below -10°C)
Estimated battery life: up to 3 years at a recording interval of 15 minutes and an ambient temperature of 25°C
The longer the interval between measurements, the longer the batteries will last
The device can store up to 1 million temperature values in its internal memory

Stopping the recording

Press the [GO] button briefly to navigate between different displays (max value, min value, battery status)
You can check this information at any time without stopping the recording

Retrieving and utilizing the data

Once back at the office, connect the device to your computer via the Mini-USB port or use the SD card to extract the data
The measurement data remains stored after reading and can be read multiple times
The data is only erased when the device is reprogrammed via the testo ComSoft software
Use the testo ComSoft software (Basic, Professional, or CFR) to program the device and modify the recording settings according to your needs

Question 8

What is the memory capacity of the Testo 175T2 and how long can I record the temperature?

Accepted Answer

The Testo 175T2 has a memory that can store up to 1 million measurement values, providing a very large recording capacity.

The recording duration depends on the measurement frequency you set (ranging from 10 seconds to 24 hours). For example:

For 3 hours of monitoring with readings every 10 seconds: 1,080 measurements (ample capacity)
For 3 hours with readings every 1 minute: 180 measurements
For several days or weeks: set a more spaced frequency (every 5, 15, 30 minutes, etc.)

With 1 million available values, you can record measurements for weeks or months depending on the chosen interval. The battery life (up to 3 years with a 15-minute interval) will therefore not be your limitation for 3 hours of monitoring.

Question 9

How to turn the Testo 175T2 on and off using the [GO] button?

Accepted Answer

The Testo 175T2 thermometer is controlled by a single button: [GO].

Turning the device on

Press and hold the [GO] button for about 3 seconds to start the measurement program. The screen will then display Rec (recording mode) to indicate that the device is operating.

Turning the device off

To stop the recording and turn off the device, briefly press the [GO] button once. The device will then switch to End mode, which stops the data recording.

Navigation and display

Once in recording mode, you can briefly press [GO] to navigate between the different displayed information: maximum values, minimum values, alarm thresholds, battery capacity, and current readings.

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