A hygrometer measures the humidity and water vapour in the air. A thermohygrometer measures both humidity and temperature.

Within a volume of air, the maximum amount of water vapour it can hold varies greatly by temperature with cold air holding a fraction of what warmer air will. Most moisture meters use temperature to give the relative humidity (RH) for a particular temperature and display it as a percentage. Most models have a built-in digital LCD display but there are several which use an analogue readout, these are primarily for continuous monitoring.

These instruments all feature built-in displays and some offer features such as datalogging, web bulb temperature or dewpoint.

RS offers a range of thermo-hygrometers, many of which can be calibrated to UCAS or RS Calibration standards to ensure accurate measurements.

What are thermohygrometers used for?

Primarily, thermo-hygrometers are used to test HVAC systems and office environments. They often feature a probe which can be inserted through an air-conditioning duct to get readings from within the ducting.

What's the difference between a thermo hygrometer and a moisture meter?

A hygrometer measures the moister in the air and a moisture meter measures the moisture within a material such as wood, paper or stud walls.

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Part Details Brand Absolute Maximum Temperature Measurement Maximum Humidity Measurement Best Temperature Measurement Accuracy Best Humidity Measurement Accuracy Power Source Model Number p Minimum Operating Temperature Maximum Operating Temperature
Carel DPWC111000 Thermohygrometer, +50°C Carel +50°C 90%RH ±1.2 °C ±3 %RH Mains DPWC111000 0°C +50°C
Wall mounting RH+temp o/p sensor,275mm L Carel +50°C 90%RH ±1.2 °C ±3 %RH Mains DPWC110000 0°C +50°C
Duct mounting RH+temp o/p sensor,275mm L Carel +50°C 90%RH ±1.2 °C ±3 %RH Mains DPDC110000 0°C +50°C
Duct mount wide range RH+temp o/p sensor Carel +70°C 90%RH ±0.7 °C ±3 %RH Mains DPDC210000 -10°C +70°C
Eberle Thermohygrometer Eberle - - - - - - - -
Humidity probe HS18/0-10V Eliwell - - - - - - - -
Humidity probe HS18/4-20mA Eliwell - - - - - - 0°C +70°C
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