OPERATION INTRODUCTION The tool is solely powered by the vehicle battery. Connect the RED (+) Positive Battery Clamp to the (+) positive battery terminal, and connect the BLACK (-) Negative Battery Clamp to the (-) negative battery terminal. Ensure that the clamps are securely attached to the correct terminals. The LED display will show the message below: Press the "OK" to enter the main menu, then choose your preferable language. 1. English 2. Fsanзais 3. Deutsch 4. Espacol 5. Italiano 6. РУССКИЙ 6. About 1. BATTERY TEST (FOR 12V BATTERY) TOPDON BT50 will test each battery according to the selected actual system standard and rating marked on the battery.