500 Amp carbon pile 12 V battery tester, Chicago Electric Power Tools Item 91129, presumed to be marketed exclusively by Harbor Freight Tools -- * 1st Batter Tester purchase from local store - Load know stripped after 5 to 10 uses. Felt bad from the 1st use, but user did not realize the knob threads were cross-threaded. Made 70 mi round trip to exchange. Battery tester clamps left large marks in the battery terminals, apparently because they are cheap, thin gauge steel coated with a very thin coat of copper. * 2nd Battery Tester ... read full review »