DUOYI DY226A Car 3 in 1 CCA Load Battery Charging Digital Capacity Tester 1. It is a product designed for traction and start-up lead-acid battery, which can satisfy the loading capacity of traction lead-acid battery and cranking ability test of start-up lead-acid battery, also it provides internal resistance parameters while testing . 2. The instrument is featured by excellent design, convenient operation, accurate reading and complete functions. Instrument adopts lattice LCD display, test process and results acousto-optic hint. 3. Its inner side adopts precise circuit and powerful digital processing unit, using four-wire Kelvin test connection method to complet a series of complicated data collection and calculation and obtain the test data of each item. 4. The inner of instrument has strengthened the input protection, to prevent polarity reversed connection, and access voltage too high, poor contact of test clip head, over temperature prompt and other protection measures, in order to make the operation more security and convenient. 5. The shell of instrument is made of solid ABS engineering materials, at the same time, its top and bottom add steel plate with opening for simulating heating part of load and equipped with fans to strengthen cooling in order to make the testing process more stable and reliable. 6. Test lines are made of pure copper thicker test wire, with four-wire Kelvin test clamp connection,test sampling value directly from the battery terminal, in order to restore the actual working condition of battery, make the test results more accurate.