4 in 1 MultimeterThis Ddigital ammeter voltmeter is used to measure voltage, current, energy and active power of electrical appliances. It has passed CCC, FCC, CE certification.Measurement range Voltage test range: D6.5~100V, current test range: 0~20A, power test range active: 0~2kW, energy test range: 0~9999kWh. Please DO NOT exceed rated parameters. 20A is only for short load, not for continuous operation. We recommend you upgrade to 50A version if you use with more than 15A continuous output.More function Large LCD display with backlight; voltage alarm function; energy reset function; Data storage when power off; Built-in shunt, no need external shunt.Wide ApplicationThis C voltmeter is suitable for indoor use and cannot be used outdoors. It can be used to monitor volt, ampere, power and power consumption of battery, solar system, electric bike generator and other fields. The load cannot exceed the rated voltage and current.PackagePackage: 1 * DC multimeter, 1 * user manual. Pay attention: Please connect according to the wiring diagram we provide. If you want to try another connection, please contact us first, wrong connection will cause the product to burn out or not work. Product Description Function to measure electrical parameters (voltage, current, active power, energy). Voltage alarm function (over voltage alarm threshold, backlight and voltage flashing in alarm). The energy key reset function. < p>Store data when power off. Large LCD display (display voltage, current, active power and energy at the same time) Backlight function. Backlight control Press the key to activate or deactivate the backlight. The backlight status will be saved when power off.Reset energyHold down the key for 5 seconds until the number flashes, then release the key.Press the key again, then the value of energy is cleared and exit the reset flashing state. If you don't want to clear, press and hold the key again for 5 seconds until the number does not flash, it means the energy value is not cleared and will exit the reset state. voltagePress and hold the key until the power display area displays SET, release the key.The voltage area displays the current high voltage alarm value, the current area displays the current low voltage alarm value and the last digit starts flashing. Press the key to adjust the value. It will automatically change the digit without operation for 3 seconds, then press the key to adjust the value as well. Voltage alarm threshold setting range: 6.5 V to 99.9 V. After completing the settings, press and hold the key until the display shows PASS. En read more Wiring diagram Precautions: This module is suitable for indoors, please do not use it outdoors. Applied load should not exceed rated voltage, current Wiring order can not be wrong.< /p>