for DC 12V LED Digital Voltmeter Thermometer 0.28 inch Dual Displa Voltage Temperature Meter Monitor For Car Motorcycle Feautres: Voltage and Temperature Dual Display Waterproof work, Fully enclosed for shell design, it can still work normally after soaking in water for a short for time 56*31mm 3-digit 0.28 inch LED digital tube display, compact size Direct measurement: Measure battery voltage + display car temperature Measurement: Avoid excessive use of electricity in the car, which affects starting the car. Temperature: Detect the temperature in the car and keep it comfortable Specifications: Product nameDouble display waterproof meter Measurement accuracy1V / 1 Temperature Range-20~150 Voltage Range8~18V [Power supply mode] for DC and for DC two lines Product introductionUsing a fully enclosed for shell design, it can display temperature and voltage values at the same for time, and directly measure without external auxiliary power supply Precautions: 1. The power supply voltage must be less than 18V 2. This meter adopts LED display and requires a certain working current, so it cannot be measured higher than the internal resistance voltage, such as weak signal voltage and button battery. 3. Pay attention to the wiring method, red positive and black negative. It cannot be reversed. Package included: 1 * Waterproof for DC 12V Voltmeter Thermometer