EK1-139 Black Automotive Dual Bank Battery and Alternator Tester

Works well. No issues.

Good product however tester LEDs are very difficult to view.

I was having shorter then average battery life in one of my cars (changed the battery 2 times in 3 years), it could because I no longer use the car much but wanted to check the charging system. I wanted this type over those that has a numeric voltage readout to simplify things and because I had one of these type in the past and it worked simply and intuitively to know if and where to start looking for any problems. I was expecting to see perhaps a low charging condition.What I did find is an overcharging condition (green and red lights on), yes overcharging could also shorten battery life - was not expecting that, but also tested my other car and got the same thing - overcharging, which has me question the reading and the calibration of this tester.In practical use I can leave it plugged in (as my car shuts off the power to the cig lighter when the car is off) and watch it in use. While driving it shows mainly those 2 lights, at times of low RPM's and at high times of electric demand, the red light will dim and go out sometimes, as in a flicker most of the time. But again this is basically for both cars. It did not really give me any answers I can use but just more questions.

Very fast shipping, I hope I do not need to use this, but if I do looks like it will do the job

Would not fit in my Mercedes cig. socket.

The jury is still out.

Very handy device even if you know very little about your vehicles charging system

One of these quit working already.