Agricultural instruments and their uses

Instrument	Measures / Used for
Altimeter	Height / Altitude
Aneroid Barometer	Atmospheric pressure
Anemometer	Wind speed / velocity
Atmometer	Leaf temperature
Auxanometer	Growth of plant
Barograph	Continuous atmospheric pressure
Campbell Stokes Recorder	Sunshine duration
Crescograph	Growth of plant
Cryometer	Measuring temperature below 0°C
Darsometer	Dew
Evaporimeter	Evapo-transpiration
Heliograph	Duration of bright sunshine hours
Hygrometer / Psychrometer	Relative humidity (RH)
Hydrometer	Relative density of liquids
Infra-red Thermometer	Canopy temperature
Infiltrometer	Infiltration
Irrometer	Water stress, soil moisture tension
Lactometer	Fat % in milk
Lysimeter	Evapo-transpiration (ET)
Planimeter	Area of an irregular figure
Penetrometer	Soil strength
Permeameter	Hydraulic conductivity
Potometer	Transpiration
Pressure Chamber / Thermocouple	Leaf water potential
Pressure Membrane Apparatus	Field capacity
Psychrometer	Leaf water potential / Relative humidity
Pycnometer	Soil specific gravity
Pyradiometer	Long and short wave radiation
Pyranometer	Total incoming solar radiation
Pyrheliometer	Direct solar radiation
Quantum Sensor	PAR (Photosynthetically Active Radiation)
Rain Gauge	Amount of rainfall
Spectrophotometer	Wavelength of light
Tensiometer	Soil moisture tension (0.8 bar)
Thermograph	Continuous measuring temperature
Wind Vane	Wind direction