Versatile testing: This car battery tester can test the voltage, current, internal resistance, cold cranking current (CCA) and state of health (SoH) of 12V batteries, helping users to understand the battery performance. Quick diagnosis: It only takes a few seconds to complete the battery test, quickly determine whether the battery needs to be charged, replaced or has other problems, saving time and energy. Strong compatibility: It is suitable for various 12V acid batteries, including ordinary car batteries, AGM batteries, EFB batteries, etc., and is widely used in a variety of vehicles such as cars, trucks, motorcycles, etc. Intuitive display: Equipped with a high-definition LCD screen, the test results are clearly displayed in digital and graphical form, and users can easily read and understand the battery status. Portable design: Lightweight and compact design, easy to carry and operate, suitable for home users and professional maintenance personnel to use, anytime, anywhere to detect battery health. Specification: LED quantity: 6 (2 red, 3 green and 1 yellow) Material of wire: 0.06square millimeter copper Max. voltage and current: 13.9V 15A Length of wire: 25cm / 9.84in Battery tester size: 12.4x5x1.8 cm/4.9x2x0.7 inches (approx) 6 LED Light Indicator Check before Battery is alive, "OK" to be charged. Alternator check : accelerate your engine to 2000 rpm when the green light is lit ,charging circuit is ok. Battery check: indicate the percentage charging in the battery. Cranking check : red light indicates voltage from Alternator over-high. Package included: 1X12V car Battery Tester