Pressure gage uses solar power
The SolarMetrix pressure gage from
Weiss Instruments, Holtsville, N.Y. (
weissinstruments.com), can operate off
of its solar cells even when exposed to only low levels
of room light.
It operates on 5 millionths of a watt, according to the company. And unlike mechanical pressure
gages, there are no gears or bearings to wear out or need
lubrication. Three rotary-dip switches let users choose
between four different units of pressure and four units
of vacuum. It can be ordered with one of six pressure
ranges, spanning from vacuum to 1,000 psi, and readings
are accurate to 0.5% of full scale.