iconUSB-TRH300: Precision USB Temperature and humidity sensor [Discontinued]
USB-connected temperature+relative humidity sensor and data logging solution.

Product Description:

The USB-TRH300 is specifically designed for environmental temperature and humidity acquisition. With its factory calibrated, linearized and temperature compensated digital sensor chip, it is field interchangeable. Thanks to its precision electronics, extremely small variations in temperature and humidity can be acquired using a standard USB port. The compact probe eases integration, even in space-constrained locations. All this makes the USB-TRH300 suitable for a wide range of applications.

This product is discontinued. It has been replaced by the USB-TRH320.

Key specifications:

  • Temperature:
    • Probe operating range:[1] -40°C to 70°C.
    • Accuracy: ±0.3°C (-20°C to 70°C), max ±0.4°C.
    • Resolution (Typical): 0.015°C.
    • Repeatability (Typical): 0.06°C.

  • Relative humidity:
    • Probe operating range: 0 to 100 %RH.
    • Accuracy: (at 25°C)
      • Typical: ±2% from 0 to 90 %RH
      • Max: ±2.5% from 0 to 90 %RH,
        ±4.5% from 90 to 100 %RH
    • Resolution (Typical): 0.01 %RH
    • Repeatability: 0.1% RH

[1] Only if cable is not moved/flexed while the temperature is below 0°C.


  • USB cable length: 1 meter (3 ft.)
  • Operating temperature range (USB cable interface): 0°C to 70°C.
  • Powered through USB
  • This product can operate at 100 %RH but is not waterproof. Protect the sensor and CPU against direct exposure to water or snow. Extra housing may be required depending on the application.
  • It is recommended to install the probe pointing down to reduce the risk of water infiltration or build-up in the probe.


  • Supported by our free QTenki data logger software.
  • Operates under Windows (XP, Win7/8/10 64&32-bit) and Linux.
  • Computes the dew point, heat index and humidex.
  • Simultaneous use of multiple Dracal sensors supported.
  • Command-line tool (usbtenkiget.exe) also available (packaged with QTenki)
  • Usable with LabView (Guide here)

Picture Gallery:




Sensor and USB connector


Included USB cable


%RH accuracy


Temperature accuracy


Logging (QTenki)


"Big view" (QTenki)


Configuration (QTenki)


Log file example

Download(s) & Link(s):
Datasheet601031 - Datasheet USB-TRH300.pdf
QTenki software (Windows/Linux) for our USB sensor productsView

LabVIEW is a trademark of National Instruments. Neither Dracal Technologies inc., nor any software programs or other goods or services offered by Dracal Technologies inc., are affiliated with, endorsed by, or sponsored by National Instruments.

website security
bank transfer logo
Solution Graphics
No PayPal account required!