This is a dual impedance true RMS digital multimeter integrating a variety of measurements like AC/DC voltage, AC/DC current, frequency, duty ratio, resistance, capacitance, temperature, diode, continuity, NCV, VFD, inrush current, etc.. And there are more functions like last data hold, flashlight, Max./Min./Relative value, Celsius/Fahrenheit degree, and zero key.Features:CLAMP MULTIMETER: Measures inrush current, VFD current/voltage, AC/DC current, AC/DC voltage, frequency, duty ratio, resistance, continuity, diode, capacitance, temperature, non-contact AC voltage (NCV) detection, and live detection.WIDE OPENING JAW: Opening jaw capacity is 40mm, wide enough to measure without disturbing the circuit.LOUD BEEP: NCV sensor send out audible and visual alarm once received electromagnetic signal.MORE FUNCTIONS: Features data hold, flashlight, low battery display, Celsius/Fahrenheit degree, Max./Min./Relative value, and Zero(reset) key.SAFE TO USE: Designed and conforms to IEC61010-1, CAT III 1000V, safe and reliable.AUTO-OFF: Auto power off within 15 minutes if there is no operation, helps conserve the battery.MULTI TESTER: Comes with 2 test leads and a thermocouple to be used as a multitester.Note:*MUST read the user manual carefully before use for safety.*Battery not included.Parameters:Display: 6000 countClamp Opening Size: 40mmAuto-off: approx. 15 minutesMax. Voltage Between Terminals and Earth Ground: AC750V or DC 1000V Range Resolution Accuracy DC Current (MAX current: 1000A) 60A 0.01A (2.5%reading+8) 600A 0.1A 1000A 1A AC Current (MAX current: 1000A, True RMS) Frequency range: 0.1~600A: 40Hz~400Hz 600~1000A: 40Hz~60Hz 60A 0.01A (2.5%reading+8) VFD:(5.0%reading+10) INRUSH:(5.0%reading+10) 600A 0.1A 1000A 1A DC Voltage Input impedance: 10M(LoZ: 300k) Overload protection: AC750V/DC1000V Maximum input voltage: AC750V/DC1000V 600mV 0.1mV (0.5%reading+5) 6V 0.001V 60V 0.01V 600V 0.1V 1000V 1V (0.8%reading+5) AC Voltage Input impedance: 10M(LoZ: 300k) Overload protection: AC750V/DC1000V Maximum input voltage: AC750V/DC1000V Frequency range: 40Hz~1kHz, True RMS 600mV 0.1mV (0.8%reading+5) 6V 0.001V 60V 0.01V 600V 0.1V 750V 1V (1.0%reading+5) VFD(750V) 0.1V (2.0%reading+5) Resistance Overload protection: 250V 600 0.1 (1.0%reading+5) 6k 0.001k 60k 0.01k 600k