A good Buy for a 12V Bench Tester is one those Battery Jumper Paks...they have a battery, a built-in charger, Bat. Voltage condition LED readouts, along with a fused aux power plug/cig lighter port. Just need a cig plug with some decent test leads on it and you are there.
Perfect for Bench testing, along with their original design use as car jumper.

I have a Homebrew Bench tester that has all those features, plus built-in Amp meter and reverse polarity switching ...and long leads w/Bannana plugs.....easy to make and nice if you do a lot of electrical testing on the bench .. I also wired in a relay that powers a 12 V Halogen in case the Shop losses power......

*Note the Polarity Switch below the Triplet Amp meter..a nice feature for small motors/etc. that require reverse polarity for cw/ccw applications

Attached Thumbnails

 

__________________
A Dalton