%
Fahrenheit or Celsius or Kelvin. Ex: 65ºF, 32ºC, 100ºK
g/m³ or mg/l
Your question is a little unclear. The devices used to record temperature and relative humidity are "thermometers (temperature)." and "hygrometers (relative humidity)". Sorry if this isn't what you were looking for.
dehumidifier
There is no such thing as a sygrometer, but a hygrometer is a device that is used to measure the humidity of the air. It can indicate relative humidity or absolute humidity.
Relative humidity expresses a percentage of humidity in the air to the maximum amount of humidity that could be in the air. For example: when the temperature rises the air will be able to hold much more humidity so the relative humidity will drop.
hygrometer used to measure density of relative humidity in air by using a sensory element such as a hair
Humidity can be directly measured by forced condensation either by pressurized or reduce the temperature and measure the water content directly. Alternative to direct measurement, humidity can be measure using air electro-conductivity since presence of water would increase the conductivity so it could interpret the conductivity to water content.
barometer A barometer measures atmospheric pressure, not humidity. A hygrometer measures humidity.
A psychrometer is an instrument commonly used to measure the relative humidity.
No. A psychrometer measures relative humidity.
what is the measurement is used to measure fluid