Which among the following instruments is used to measure rainfall.
Rain gauge
The rain guage is a device used for collecting and measuring rainfall.
Thermometer is an instrument that is used to measure temperature.
Pycnometer is a standard vessel often provided with a thermometer for measuring and comparing the densities or specific gravities of liquids or solids.
Lastly, sphygmomanometer is an instrument that is used for measuring blood pressure.