Humidity measurement instruments test for absolute humidity, relative humidity, or dew point in air.

Weather instruments are designed to measure one or multiple components of weather including wind speed and direction, rain or snow fall, solar radiation, temperature, pressure and humidity.

Temperature instruments use contact or noncontact methods to measure temperature.

Humidity transmitters provide electrical outputs that are proportional to humidity inputs.

Moisture meters are used to measure the moisture content in bulk solids, liquids and gases.

Lamps are light sources that emit incoherent light for illumination.

Air scrubbers, wet scrubbers, and gas scrubbers are air pollution control devices that use a high-energy liquid spray to remove aerosol and gaseous pollutants from an air stream.