Hi,
I've got a battery box with a 115AH deep cycle battery for power in a tornado shelter.
I had a thought that it would be nice to mount one of the cheap harbor freight $2 multimeters to it to monitor the voltage. They usually run on a
9 volt batter and consume a nice and small 0.3ma. What I don't know is if 12-14 volts would fry it or if it would do fine on that. Is there an easy (read cheap) way to drop the 12-14 volts down to 9 volts without increasing the power consumption very much?Thanks,
Alan