The battery internal resistance testing Our company specializing in the production of battery internal resistance tester, products with high precision, good stability, test speed and high precision display of internal resistance tester. Battery internal resistance tester is a kind of using alternating current test battery internal resistance of the new instrument, it also can test battery voltage at the same time, the operation is simple, practical and reliable, high ratio of performance characteristics. Testing four-wire method is used to clamp, effectively eliminate the measuring error caused by the contact resistance.