Rain Guage
Once rain has fallen, water often returns to the ocean from collection in rivers and lakes. Sometimes water falls directly into the ocean as rain.
I am kind of an old salt. In my day we used the real thing...a mercury "U" tube manometer. It measures inches of water or microns (1 1000 of a meter). In other practical needs, we used water drawn up a plastic pipe. Atmospheric pressure is about 15# or about 30' of water. We did this when drawing water out of shallow wells. Hope this helps.
The Pacific Marine Environmental Laboratory developed the first reliable scientific instrument for detecting tsunamis and quickly alerting scientist when tsunami occurs. The instrument, known as TSUNAMETER, is anchored on the ocean floor and measures changes in water pressure when a tsunami passes above.
Distilled water
Humidity means the amount of water vapor in the air. It begins with the letter H.
There are a lot of instruments used to measure water volume. There's also the displacement method to measure liquids.
Cusec
A thermometer
A flow meter.
a stopwatch
Potometer
dewpoint apparatus
a graduated cylinder
250 ml beaker
it measures the amount of water that fell from the sky
a refractometer
a rain gauge measures the amount of rain, snow, or any liquid that falls from the skyThe rain gauge measures the amount of water, snow or any liquid that falls from the sky, to view the water level