The Ridgid CM-100 Micro Clamp Meter is a true RMS and AutoRanging digital clamp meter with a large capacity and measuring range. It can clamp around cables up to 30mm O.D. and measure current up to 1,000A AC/DC. The clamp meter can also be used as a multimeter for 8 other functions, and will provide clear and accurate readings on its large backlit LCD. The slim and double-moulded design provides easy one-handed operation and can be conveniently used in confined cable compartments. Supplied with soft carrying case, test leads, Type K temperature probe and 9V battery. Functions and Range: Voltage AC/DC: 400mV - 600V.Current AC/DC: 40A - 1,000A.Resistance: 400 - 40M.Capacitance: 4nF - 40mF.Frequency: Up to 4kHz.Diode Test: 1.5V.Continuity Test: 35.Temperature: -40° - 1,000°C. Specifications: Power Source: 9V battery (included).Display: 4,000 Count backlit LCD.Clamp size: Max. 30mm O.D. cable.Overload protection: CAT III 600V.Polarity Indication: Yes, automatic.Auto Power-Off. Yes, after 20 minutes.AutoRanging: Yes.True RMS: Yes.Data and Peak Hold: Yes.Bargraph Display: Yes.