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