It is a 3in1 Digital Tester/Multifunction Voltmeter/Thermometer/Clock Panel Meter, Power Supply voltage: DC7~30V, Measuring temperature: -55°c ~ 125°c, Measuring voltage: Range 0~200VDC, Clock: 24-hour, It has small size, high efficiency, long term stable and reliable quality,easy installation and use . Applied to the Indoor, Outdoor, Car,Water, Refrigerator, Aquarium ,home,factory,garden,And other platforms.