This BT309Pro 12V battery tester is professional for testing 12‑volt vehicle batteries, cranking system and charging system. It supports AGM, GEL, Flooded and EFB batteries, widely compatible with cars, motorcycles, trucks, SUVs and boats. Equipped with clear LCD screen, it can quickly read battery health status, cold cranking amps, voltage and charging data. Reverse‑connection protection design prevents wrong operation damage.
