How about using Mass measuring techniques? The reset function would be accomplished by a heating element and some holes inthe bottom of the receptacle, OR maybe you could collect the snow, and melt it in one operation, and then use the resulting water, (and a standard rain measuring sensor) to determine the snowfall. (this , coupled with a therometer, could allow the same instrument to measure two things ie: if it's below zero celcius, the "rainfall" is snow,if it's above zero degrees, then the 'rainfall" is rainfall., how's that for a versatile instrument!!!!! Des >>> Randy Glenn 2/18/00 8:42:11 am >>> The rainfall thread reminded me of a question I was trying to answer: HYow would one electronically measure snowfall, in centimetres? I was thinking maybe something to do with sonar, or maybe an optical pair (transmitter and receiver on opposite sides) that travels vertically? -Randy Glenn E-Mail: PICxpert@yahoo.com Web: http://i.am/PICxpert Currently wondering why I can't get in to Safe Mode - where's a Mac when you need it? __________________________________________________ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com