Features: 3-in-1 car instrument, integrating oil pressure gauge, water temperature gauge and voltmeter, With LCD digital display, clear and easy to view It can work under ultra-wide voltage, 40V can also work normally. When the voltage is too high or too low, it will flash and alarm. It has the function of anti-shake of oil level, and it can keep normal display even if the car is bumped or the oil float is opened. With self-learning function, it can match the oil float resistance value of any model. 9-36V working voltage, suitable for most models on the market, such as car, truck, RV, SUV, etc. Specifications: Color: Black Material: Plastics Working Voltage: 9-36V Working Temperature: -40 - 50℃ Working Humidity: 45%-75%RH Voltage Test Range: 9-39V, Accuracy: ±0.1% Water Temperature Measurement Range: -10-120℃, Accuracy: ±0.1% Oil Test Range: 0-1.0MP, Accuracy: ±0.1% Item Size: 96 * 63 * 31mm/ 3.8 * 2.5 * 1.2in Package Size: 123 * 93 * 52mm/ 4.8 * 3.7 * 2.0in Package Weight: 266g/ 9.4oz Packing List: 1 * Car Instrument 2 * Screw