The Extech MA440-NIST AC Compact Clamp Meter with Non-Contact Voltage Detector features a 1.2" (30mm) jaw size fits conductors up to 500MCM, a built-In Non-Contact Voltage Detector (NCV), and a large backlit LCD display. The MA440 multimeter functions include Resistance, Diode Test, Continuity, Capacitance and Frequency, as well as AC/DC Voltage, and AC Current. Additional attributes include a relative Mode for Capacitance, data Hold freezes reading on display, and Auto Power Off with disable and Low Battery Indicator. It includes NIST Certification.