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USB Humidity & Temperature Data Logger (HT20) with Display

Model #: HT20
Showroom Only


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Category Hygrometers / Humidity

The General Tools HT20 is a compact, battery-powered thermo-hygrometer capable of unattended logging (recording) of the ambient temperature and relative humidity (RH) of an environment for days, weeks or months. Data logging can be started or stopped by pushing a button on the unit, eliminating the need to bring a laptop to the job site. After a data log has been captured and stored, it can be uploaded as a .txt file to any PC running the Windows®7 or Windows® XP operating system after plugging the HT20 into one of the computer’s USB ports. The HT20’s internal flash memory is large enough to store up to 8000 pairs of humidity and temperature readings. Included with the product, which is slightly larger than a thumb drive, is a mini-disc with the drivers needed to interface the unit to the computer, as well as software that can display a data log file as a table or graph and/or export it to Microsoft Excel. Exporting to Excel is recommended for sophisticated trending and analysis of humidity and temperature data and easy detection of unexpected excursions. 3A self-contained USB compact data logger that can be deployed on a job site or in key areas of a facility and left unattended for days, weeks or even months. The temperature and humidity readings they make and collect can be uploaded to a PC and viewed in Excel, making it easy to spot trends and unexpected excursions.

  • Datalogger plugs directly into USB port or can be used with supplied extension cable for convenience.
  • USB interface so there is no need for cables, cradles or docks
  • Included interface software enables setting of:
    • Sampling time
    • Hi/Lo alarm setpoints for humidity, temperature
    • Logging start/stop times
    • Temperature unit (°F or °C)
  • Software also calculates dew point and displays data logs as time-based graphs synchronized to your PC’s clock
  • Uploaded data logs viewable as table or graph
  • One-click exporting of uploaded data to Excel or Word
  • Immediate, delayed or push-to-start logging
  • LCDs display real-time and Min/Max readings


  • Temperature Measurement Range: -31° to 212°F (-35° to 100°C)
  • Temperature Accuracy: ±0.7°F (0.4°C)
  • Temperature Measurement Resolution and Repeatability: ±0.2°F (0.1°C)
  • Relative Humidity (RH) Measurement Range: 10 to 90%
  • Relative Humidity (RH) Accuracy: ±3%
  • Relative Humidity (RH) Resolution and Repeatability: ±0.1%
  • Internal Storage Capacity: 16,384 readings
  • Dimensions: 5" x 1.1" x 2" (126 x 28 x 51mm)
  • Weight: approximately 7 oz.
  • Power Source: 3.6v Non-rechargeable Lithium-Ion Battery (Type SB-AA02)
  • Battery Life: approximately 1 year (typical)

Supplied with:

  • USB extension cable
  • Bracket
  • Logging software Windows®7 or Windows® XP operating system
  • 1/2 AA 3.6v Lithium Ion battery
  • Users manual
  • Manufacturers limited 1 year warranty

Do not use the HT20 in the presence of flammable or explosive gases.

UPC: 681035015032
Search Category: Hardware > Tools > Measuring Tools & Sensors
Previous Product Product 31 of 32 Next Product
Category Hygrometers / Humidity
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