Instruments and what they measure

Important instruments and what they measure

Instrument	Measurement
Pyranometer	Total incoming radiation
Pyrheliometer	Direct solar beam irradiance
Crescograph	Continuous record of plant growth
Hygrometer	Relative humidity
Lysimeter	Evapo-transpiration
Aerometer	Density of gases
Piezometer	Pressure of ground water
Evaporimeter/Atmometer	Evaporation
Rain guage/Pluviograph	Rainfall
Hygrograph	Continuous measure of humidity
Pycnometer	Specific gravity of soils
Aerometer	Density of gases
Pyrgeometer	Terrestrial radiation
Drosometer/Octalis dew guage	Dew
Barograph	Continuous atmospheric pressure
Barometer	Atmospheric pressure
Quantum Sensor	Photosynthetically Active Radiation
Anemometer	Wind velocity
Wind vane	Wind direction
Hair hygrometer	Relative humidiy inside room