As a farmer I have several batteries. This works great on both my tractor and automotive batteries. Is easy to hold with the narrow grip and easy to read in most light. Would definately recommend.
This is a great little tool for any one, even a professional auto mechanic, who has a need to do a real test on a car battery. I now own one and it is great!
Why: I once took my car to an Auto Shop to have a failing car battery tested while it was still under warranty. They performed the test using a battery charger, which took over an hour, just to see if it could hold a charge, they used this method to see if the battery was any good or not. They said it was good - I found out later that you need to use a Load Tester which is standard and not a Battery Charger, for a Real Battery Test. They could...
I bought this to determine whether my automobile batteries need to be replaced. It told me that my battery was weak, which correlates to having to jumpstart my vehicle after a long trip. It also checks the charging system which it told me was OK. I plan on replacing my battery soon.