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Portable Thermohygrometer with Integrated Probe


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HI93640 is a compact, portable thermohygrometer designed to provide peak performance anywhere. Measurements of temperature and relative humidity are made easy with the rugged housing of the meter and built-in sensor. HI93640 features temperature readings in both Celsius and Fahrenheit, and a removable sintered cap protecting the sensor.

  • Integrated humidity sensor for one handed operation
  • °C/°F temperature readout
  • Removable sintered cap


The HI93640 is a compact, portable thermohygrometer designed to provide high accuracy temperature and relative humidity (RH) readings anywhere. The meter offers a simple interface and a Battery Error Prevention System (BEPS). The compact housing and rubber keys resist the ingress of dust and protects the device from accidental splashes.

The HI93640 has selectable temperature and RH modes. The measurement mode can easily be switched at the press of the RANGE button. Both temperature and RH are measured with an integrated sensor protected from dust by a sintered cap.

Features at a Glance

Built-in Sensor - The HI93640 contains a built-in thin-film polymer capacitive (TFPC) sensor that accurately measures relative humidity and temperature.

°C/°F Readout - Temperature is displayed in °C or °F. A slide switch on the HI93640 allows the user to change the temperature readout unit.

Battery Error Prevention System (BEPS) - The Battery Error Prevention System detects when the batteries become too weak to ensure reliable measurements.


RH Range 10.0 to 95.0% RH
RH Resolution 0.1% RH
RH Accuracy ±3% RH (50 to 85 % RH); ±4% RH (outside)
Temperature Range 0.0 to 60.0°C / 32.0 to 140.0°F
Temperature Resolution 0.1°C / 0.1°F
Temperature Accuracy (@25ºC/77ºF) ±0.5°C /±1°F
Battery Type/Life 1.5 AA (3) / approximately 1000 hours of continuous use
Environment 0 to 60°C (32 to 140°F); RH max 98% non-condensing
Dimensions 190 x 80 x 36 mm (7.5 x 3.1 x 1.4’’)
Weight 250 g (8.8 oz.)
Ordering Information HI93640 is supplied complete with probe sintered cap, batteries (3 x 1.5V AA) and instructions.
Warranty 2 years