["Features:\r\nThrough-hole design: No wiring difficulty. Measure positive or negative current. No current direction limitation \r\nElectrically isolated from high voltage power source which eliminates risk to delicate monitoring equipment and also minimizes safety concerns \r\nDisplay Voltage or (+ -)Current. Voltage Range: 5V-120V. Current range: 0-100A\r\nLarge wire capability: Diameter of the hole through sensor is 3/4 inch(19 mm) \r\nLoop through sensor multiple times to strengthen signal. For example, if your current signal is only 0.2 Amps, you could loop the wire through the sensor 10 times and the signal would by 10X for stronger and would appear as 2.0 Amps \r\n\r\nDescription:\r\nHall effect current meter reads current by detecting the magnetic field around the wire, there is no electrical contact which eliminate risk to delicate monitoring equipment and also minimizes safety concerns. The sensor doesn'for t get hot like the current shunt sense resistor which can have thermal temperature heat dissipation issues.\r\n\r\nThree display modes:\r\n1. alternately display Amps and Voltage\r\n2. only display Amps\r\n3. only display Voltage\r\n\r\nSpecifications:\r\nMeasurement Range: + -100A\r\nAccuracy: + - 1%\r\nResolution: 0.3A\r\nWorking current: 7-15mA\r\nPower supply: for DC 5-120V\r\nProduct Dimensions: 48mm*29mm*23mm\r\nMounting hole: 45.5mm*25.5mm\r\nSensor hole diameter: 19mm\r\nOperating temperature: -4°F - 140°F (-20°C - 60°C)\r\n\r\nAs the resolution is 0.3A, the current reading might be flickering with 0.3A difference. For example, if the current is 1.7A, you might see a 1.7A and 2.0A alternatively. This is normal.\r\nIf your signal is too weak or you are not getting the resolution you want, you can coil the wire through the current sensor as many times as you want to double, triple, or quadruple the sensitivity or resolution.\r\nFor example, if your current signal is only 0.2 Amps, you could loop the wire through the sensor 10 times and the signal would by 10X for stronger and would appear as 2.0 Amps. \r\n\r\nNote:We have more detailed manual, if you need an electronic user manual, please contact us.\r\n\r\nPackage included:\r\n1x Digital Voltmete Ammeter\r\n1x Hall Effect Sensor"]