The product doesn't work as it should. When I put it on a car, it says the battery is dead, however, the battery is fine (the car starts flawlessly, the battery was bought 3 months ago and even the green light on the battery confirms it's charged). I tried changing the position of the clamps countless times, yet, the same result: dead battery. I didn't even tried the tester on a battery out of the car as it should work on batteries in and out of cars. The tester apparently does indicate correct crank and charging results (alternator is new and starter doesn't sound/look bad at all) though.
works great, runs on power from the battery. The last measurment stores in the memory