A thermometer is a device that measures temperature or temperature gradient using a variety of different principles.
Daniel Gabriel Fahrenheit invented the thermometer. The thermometer measures the temperature.
Evangelista Torricelli invented the Barometer
An instrument that uses the difference in readings between two thermometers, one having a wet bulb and the other having a dry bulb, to measure the moisture content or relative humidity of air.
Sir John Leslie invented the Sling Psychrometer
invented by Shem Drowne
invented by Leonardo di ser Piero da Vinci
Antoine Baumé invented the hydrometer