DUOYI DY2015 Car 12V Battery Tester Digital Diagnostic Tools1. Storage battery testers are used for activated style leadacid storage battery 2. Precise circuit and strong digital processing unit make it complete collection of a series of complicated data and figure out every test data, which availably by 4-wire Kelvin test connection. 3. Besides it strengthens input protection inside , in order to prevent such situations as polar reversal connection, over-high voltage input, poor contact of the test clamps and so on. That makes sure safer and more convenient when testing. 4. This tester is the best tool for battery sales, vehicle repair and condition check of all kinds of lead-acid batteries that used in equipment system associated with lead-acid battery. 5. With large LCD display, easy to read the value 6. Fully diagnose the battery status and car charging system 7. Battery test: cold cranking amps, battery resistance, voltage, life analysis 8. Engine system test: the change of battery system with the process of startup 9. Charging system test: the charging system working state of the output 11. Maximum load system test: the maximum load state of battery 12. Rich Parameters measured and displayed for battery condition diagnose 13. Overload protection and wrong connection protection keeps operator always safe 14. Easily read out conclusion of battery condition goodOKpay attentionreplace 15. Loose lead detection, unit conversion CCAIECENDIN