Voltage readings on multimeters can drift off if the internal battery is low a precision voltage source like this one doesn't cost much and will let you know if you can trust your meter.
Also very useful for making sure you are on the right scale when using a scope
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
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Last edit: 5 years 10 months ago by Andy.MacFadyen.