This is the third review unit I have bought (I returned the first two) and it does what you would expect. Displays the VOLTAGE difference between clamp and sensor. KEY MOMENT. it also indicates POLARITY. red light for positive probe voltage and green light for negative probe voltage. If you ONLY work with negative ground systems and the clamp is on the frame (ground), many of these testers will work. However, if you have a situation where the probe tip is on the negative side, THIS DEVICE will still display voltage (and negative polarity). The last thing you want is for the tester not to show NO voltage when in fact it's just BACK. This makes this tester trustworthy, unlike the other two testers I ordered and returned. Well thought out product. feels solid. works in a positive or negative environment.
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