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D3121 Thermo-hygrometer and data logger

Brand: Comet
Product Code: D3121
Availability: In Stock
Price: AUD672.00

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D3121 Thermo-hygrometer and data logger (D3121) by

D3121 Thermo-hygrometer and data logger

Thermometer, hygrometer is designed for measurement and datalogging of temperature, relative humidity into the internal non-volatile memory.

Free PC program enables to transfer recorded data to the computer for evaluation. LCD backlight.

Audio and optical alarm of measured values.
Memory of minimum and maximum measured values.
Function Hold - manual storing of actual values for later displaying.

Data logger is connected to the PC through included USB cable only for data trasfer from the memory. During connection with the PC no measurement and record is enabled.

Simultaneous reading of temperature and relative humidity, dew point temperature reading selectable, external temperature-humidity probe with 1meter cable. Cable lengths 2 and 4 meters available optionally. Probe diameter is 18mm, length 135mm.

Included in delivery:

  • Traceable calibration certificate
  • 9V battery
  • Instruction manual
  • Plastic transport case
  • Connector for external ac/dc adapter
  • mini USB cable
  • Self adhesive Dual Lock for easy installation
  • Free basic Windows software is ready to download at folder Download


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Technical parameters


Measured Value

Temperature + Relative Humidity

Construction Type

With T+RH Probe on Cable

Temperature Measuring Range

-30 to 105 °C

Data Logging Function


Operating temperature range

-10 to +60°C

Temperature sensor

RTD Ni1000/6180ppm

Accuracy of temperature measurement with built-in sensor


Accuracy of air humidity measurement

±2.5%RH from 5 to 95% at 23°C, resolution 0.1%

Accuracy of dew point measurement

1.5 °C at ambient T < 25°C and RH>30%,
range -60 to +80 °C


battery 9V

Battery life

4 months typically

Real time clock

year, leap year, month, day, hour, minute, second

PC interface


Sampling interval in data logging mode

10s to 24hours (18 adjustable intervals)

Total memory capacity

up to 16000 recorded values

Data logging modes

noncyclic - data logging stops after filling the memory
cyclic - after filling memory oldest data is overwritten by new


141 x 71 x 27 mm, probe length 135mm, probe diameter 18mm

IP protection


Weight including battery without probe

approximately 150g


3 years