This versatile charging system (battery and alternator) tester requires no internal battery of its own and is ultra-compact for maxiumum convenience. - Color-coded LEDs quickly indicate condition of part - Tests 12V batteries - Check operation of alternator - No internal batteries required
Needed a simple battery tester 
Yep, it tests a 12V battery and can help determine how much energy is being supplied by your alternator. The best part of this device is that no internal batteries are required. Nice.
The instructions were not very good, which is why I deducted one star.
One example of the poorly written instructions is the LED read-out on the front panel. If you have a good battery, all three LEDs illuminate, and can be confusing. I would expect a good battery to light the "Good" LED, not all three. It is still a good purchase for some basic car troubleshooting.
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