A snow gauge is a type of instrument used by meteorologists and hydrologists to gather and measure the amount of solid precipitation (as opposed to liquid precipitation, which is measured by a rain gauge) over a set period of time.
[citation needed] When snow is collected, the container is removed and replaced with a spare one.
[citation needed] An estimate of the snow depth can be obtained by multiplying the water equivalent by a factor of 10.
Another problem occurs when both snow and rain fall before the observer has time to change the gauge.
Inside the pillow is a liquid such as an environmentally safe[citation needed] antifreeze.
This type of sensor works well for many locations but is more difficult to use in areas of hard blowing snow.