Humidity, dewpoint and temperature measurement instruments
Relative humidity (RH) is defined as the ratio of the water vapor pressure or water vapor content to the saturation vapor pressure or the maximum vapor content at the temperature of the air or gas. The saturation vapor pressure in the air varies with air temperature, the higher the temperature, the more water vapor it can hold. When saturated the relative humidity in the air is 100 %RH.
Portable Hand-Held Instruments and Calibrators
	Vaisala Instruments HM70 Hand-held Humidity and Temperature Rugged and reliable high-accuracy meter for demanding applications. Ideal for on-site checking and transmitter calibrations. Accredited calibration available. DM70 Hand-held Dewpoint Meter The meter measures dewpoint accurately in a wide measurement range. It can be used in many industrial spot-checking applications as well as a one-point calibration check for fixed dewpoint transmitters. HM34 Light-weight pocket-sized humidity meter which provides fast and convenient spot-checks of relative humidity and temperature HMI41 Relative Humidity and Temperature Indicator is versatile and easy to use. With a choice of five different probes it gives you flexibility to work in a variety of applications. HMK15 Humidity Calibrator enables easy and reliable on-site calibration of humidity instruments. Based on saturated salt solutions.
	APT Instruments RH1000 RH Pen Small, pen-sized thermo-hygrometer fits easily into pocket or tool box. Great little tool for indication of room temperature and relative humidity RH1210 RH Modular meter and probe enables delivers greater accuracy of RH readings with flexible positioning of the probe. RS-232 Output RH100 RH Low-cost Vdc-powered transmitter provides continuous analog output proportional to RH and Temp of the environment. Ideal for integration into control system

RH Portable Instruments