I bought a Radio Shack VOM 20 years ago. It is digital, and has a
large display and a sound continuity tester that I have found very
useful. The handle folds back and acts like a stand, which is
convenient at times. I remove the batteries before storing it as
recommended by the manufacturer. A fuse blew in it one time, and got
a replacement at RS. I think I paid $20 for it.
You don't need a battery tester for ordinary batteries if you know
what the voltage is supposed to be. Nicad and NiMH are a bit more
difficult. To get a load just put an appropriate light bulb across
the battery with the meter in parallel.
Before I had a battery tester, and I have 3 v meters, I threw away good
batteries, could not match pairs and kept bad ones. A battery tester
puts the correct load for each cell so you can determine if it is worth
keeping and for how long. Plus you can match odd cells to the power
left. I saved alot with a battery tester, no more gussing. A bulb will
not be the correct load a V meter will not indicate Life Left.
Harbor Freight has VOM's as cheap as th ree bucks, now and again.
If you're testing batteries, you oughta have a battery tester. VOM read wtih
very little added load. Battery tester supplies a little load while it's
testing. Radio Shack has these for ten bucks or so.
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