12V 24V Automotive Battery Voltage Tester (Black) Connect To 12V Car Battery When connected to a 12V car battery, different voltages will display different signals: Switch to 12V 1. 0V-4.5V: The product cannot start, please replace the battery. 2. 4.5V-11.3V: The OK light flashes, and the other lights are off. The higher the voltage, the more frequent the flashing. When it reaches 11.3V, the OK light is always on. 3.11.3V-12V: The low light flashes, and the OK light is on. The higher the voltage, the more frequent the flashing. When it reaches 12V, the low light is on, and the other lights are off. 4. 12V-12.5V: The middle light flashes, and the low light is on. The higher the voltage, the more frequent the flashing. When it reaches 12.5V, the middle light is on, and the other lights are off. 5. 12.5-13.4V: Full beam flashes, center beam is on. The higher the voltage, the faster the flashing frequency. Upon reaching 13.4V, the full beam is on and the other lights are off. 6. 13.4V-14.4V: Good beam flashes, full beam is on. The higher the voltage, the faster the V. Upon reaching 14.4V, the good beam is on and the other lights are off. 7. 14.4V-15.5V: Fault lights are flashing, good beam is on. The higher the voltage, the faster the flashing frequency. Upon reaching 15.5V, the fault lights are on and the other lights are off. Connect To 24V Car Battery Connecting to the 24V car battery, different voltage will show different signals: Switch to 24V 1. 0V-4.5V: product can not start, please replace the battery 2. 4.5V-20V: OK light flashes, other lights do not shine. The higher the voltage, thefaster the flicker frequency. When reaching 20V, OK light is always on. 3. 21V-23V: LOW light flashes, OK light is on. The higher the voltage, the fasterthe flicker frequency. When reaching 23V, the LOW light is on and the other lightsare off. 4. 23V-24.5V: MIDDLE light flashes, LoW light is on. The higher the voltage, thefaster the flicker frequency. Wh