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I am a bit of a hard head when it comes to this kind of stuff. I really like to know whats happening when I am trying to diagnose something. This is really something most home mechanics don't need, and I could certainly get along without it. Most of the time its pretty obvious when your battery is dying and needs to be replaced. BUT, if you are like me and are a bit obsessive about knowing whats happening, and are interested in the issues of how long a battery lasts, and how much cranking power it has, etc, this is the unit for you. It is a bit complex to use, and some of the explanations in the instructions aren't completely clear, BUT, the tech support was wonderful, responded quickly and competently to my questions.It really does analyze the condition of your battery. I think the most important single thing it does is it actually measures the voltage drop when you start your car. That gives an excellent measure of how much reserve ability your battery has. A very cool unit. I really like it, but do I need it? No.
Click Here to see more reviews about: Argus AA400 Professional Digital Battery Tester and System Analyzer
Save time and sell more batteries!Argus Analyzers' AA400 hand-held battery analyzer, powered by the patented Crank-Check and Capacity-Checktechnologies, delivers the automotive service professional fast and accurate battery performance diagnostics to identify weak batteries before they fail.The comparison of measured Cold Cranking Amps (CCA) to the factory specified CCA provides the percentage of battery life remaining.In addition, the measurement of the battery's capability of starting an engine - Cranking Health -is also displayed as a percentage.This tool features an intuitive easy-to-use interface and a display that provides clear, graphical information on battery health, the starting system, and the alternator charging system.Argus AA400 features diagnostics important to the automotive service professional, including temperature compensation and state-of-charge compensation which will provide accurate test results from discharged batteries. 3 year warranty - Argus will repair or replace (at our option) defective product within the warranty period.

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