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The OEMTOOLS 24338 100 AMP Battery Load Tester tests battery load, condition and starter motor draw. Designed to work with both 6V and 12V batteries (up to 1,000 CCA) in all climates and situations, this versatile tester provides an easy-to-interpret battery condition reading. Test battery condition, on or off the car, in just 10 seconds.Warning - This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm.