Hygrometers

A hygrometer measures the humidity and water vapour in the air. A hygrometer measures both humidity and temperature, and it does this by calculating of both air pressure and temperature changes, which results in the moisture's percentage in the air. Used in environments that require constant monitoring of humidity, this could be in food processing where it’s imperative that humidity stay at a constant as it could affect production.

Within a volume of air, the maximum amount of water vapour it can hold varies 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.

Types of Hygrometers?

Depending on your requirements, the hygrometer needed is important, some types of hygrometers include:

  • 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.
  • Digital hygrometers offer a modern approach to for easy-to-read measurements and sometimes feature an in built data logger for recording measurements for analysis. Digital thermohygometers feature a digital display, such as the Testo 608-H1 uses an LED display to monitor temperature changes and a capacitive humidity sensor to provide dew-point calculations through the use of a probe. However digital thermohygrometers are available as resistive and capacitive, both have different methods to achieve accurate results.

What’s the difference between a 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.

Why choose RS Components for a Hygrometer?

RS Components not only has a vast range of hygrometers from leading brands such as Testo, Rotronic Instruments, Fluke and our very own brand RS PRO, but an in house calibration service. This calibration service is to RSCAL and UKAS standards and ensures accurate and reliable measurements.


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Description Price Absolute Maximum Temperature Measurement Hygrometer Type Maximum Humidity Measurement Best Temperature Measurement Accuracy Temperature Measurement Resolution Best Humidity Measurement Accuracy Humidity Measurement Resolution Dewpoint Measurement Meter Type Calibrated Interface Type Printer Functions Power Source
RS Stock No. 123-2352
BrandRS PRO
£200.00
Each
Units
- Digital Hygrometer - - - - - - - RSCAL - - - Battery
RS Stock No. 123-2210
BrandRS PRO
£89.00
Each
Units
- Digital Hygrometer 99%RH - 0.1°C ±3 % HR 0.1%RH - - - - No Dew Point, Hydrometry, Max/MIN/HOLD, Temperature Battery PP3
RS Stock No. 123-2353
BrandRS PRO
£219.00
Each
Units
- Digital Hygrometer - - - - - - - UKAS - - - Battery
RS Stock No. 106-5306
BrandRS PRO
£73.50
Each
Units
+50°C Digital Hygrometer 99%RH ±1 °C 0.1°C ±5 % 0.1%RH Yes Handheld - - - Data Hold Battery
RS Stock No. 123-2233
BrandRS PRO
£136.17
Each
Units
+140 °F, +60 °C Digital Hygrometer 95%RH ±0.5 °C, ±0.9 °F 0.1 °F, 0.1 °C ±3 %RH 0.1%RH Yes Handheld - - - Dew Point, Hold, Maximum & Minimum Display, Record, Relative, Wet Bulb Battery
RS Stock No. 123-2269
BrandRS PRO
£245.17
Each
Units
+140 °F, +60 °C Digital Hygrometer 95%RH ±0.5 °C, ±0.9 °F 0.1 °F, 0.1 °C ±3 %RH 0.1%RH Yes Handheld RSCAL - - Dew Point, Hold, Maximum & Minimum Display, Record, Relative, Wet Bulb Battery
RS Stock No. 123-2270
BrandRS PRO
£266.17
Each
Units
+140 °F, +60 °C Digital Hygrometer 95%RH ±0.5 °C, ±0.9 °F 0.1 °F, 0.1 °C ±3 %RH 0.1%RH Yes Handheld UKAS - - Dew Point, Hold, Maximum & Minimum Display, Record, Relative, Wet Bulb Battery
RS Stock No. 123-2372
BrandRS PRO
£232.25
Each
Units
+140 °F, +60 °C Digital Hygrometer 95%RH ±0.4 °C, ±0.8 °F 0.1 °F, 0.1 °C ±3 %RH 0.1%RH Yes Handheld RSCAL - - Dew Point, Hold, Memory, Read Battery
RS Stock No. 123-2230
BrandRS PRO
£121.25
Each
Units
+140 °F, +60 °C Digital Hygrometer 95%RH ±0.8°C, ±1.5°F 0.1 °C, 0.1 °F ±3 %RH 0.1%RH Yes Handheld - - - Dew Point, Hold, Memory, Read Battery
RS Stock No. 200-5028
BrandRS PRO
£271.25
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 123-2232
BrandRS PRO
£371.05
Each
Units
+1333 (Type2) °C, +140 (Type1) °F, +2431 (Type2) °F, +60 (Type1) °C Digital Hygrometer 95%RH ±0.1 %, ±0.8 °C, ±1.5 °F 0.1 °F, 0.1 °C ±3 %RH - Yes Handheld - - Yes Dew Point, Hold, Maximum & Minimum Display Battery
RS Stock No. 192-6502
BrandRS PRO
£333.91
Each
Units
+100 °C, +212°F Digital Hygrometer 100%RH ±0.4 °C, ±0.8 °F 0.1 °C, 0.1°F ±3 %RH 0.1%RH Yes Handheld RSCAL USB - Alarm, Comparator, Data Hold Battery
RS Stock No. 195-9129
BrandRS PRO
£19.71
Each
Units
- Digital Hygrometer 99%RH - 0.1 °C, 0.1 °F ±4 %RH 0.1%RH No Digital - - No Measuring Battery
RS Stock No. 192-6503
BrandRS PRO
£374.91
Each
Units
+100 °C, +212°F Digital Hygrometer 100%RH ±0.4 °C, ±0.8 °F 0.1 °C, 0.1°F ±3 %RH 0.1%RH Yes Handheld UKAS USB - Alarm, Comparator, Data Hold Battery
RS Stock No. 192-6504
BrandRS PRO
£271.43
Each
Units
+100 °C, +212°F Digital Hygrometer 100%RH ±0.4 °C, ±0.8 °F 0.1 °C, 0.1°F ±3 %RH 0.1%RH Yes Handheld RSCAL USB - Alarm, Comparator, Data Hold Battery
RS Stock No. 196-8736
BrandRS PRO
£16.95
Each
Units
- Digital Hygrometer 99%RH - - ±5 %RH - - - - - - - -
RS Stock No. 192-6505
BrandRS PRO
£312.43
Each
Units
+100 °C, +212°F Digital Hygrometer 100%RH ±0.4 °C, ±0.8 °F 0.1 °C, 0.1°F ±3 %RH 0.1%RH Yes Handheld UKAS USB - Alarm, Comparator, Data Hold Battery
RS Stock No. 127-8296
BrandRS PRO
£162.43
Each
Units
+100 °C, +212 °F Digital Hygrometer 100%RH ±0.4 °C, ±0.8 °F 0.1 °C, 0.1 °F ±3 %RH 0.1%RH Yes Handheld - - - Alarm, Comparator, Data Hold Battery
RS Stock No. 155-8900
BrandRS PRO
£38.94
Each
Units
- Digital Hygrometer 100%RH ±0.5 °C 0.1°C ±3 %RH 0.1%RH - - - Bluetooth - - Battery
RS Stock No. 165-1486
BrandRS PRO
£13.12
Each
Units
+60°C Thermohygrometer 80%RH ±5 % - ±5 % - - Analogue - - - Measuring -