HVAC Multimeter with Non-Contact Voltage Detector & Type-K Temperature function The Extech EX363-NIST Compact HVAC True RMS MultiMeter with Built in NCV & NIST is a Compact HVAC True RMS MultiMeter with a Built in Non Contact Voltage Detector. The Extech EX363-NIST features a highly accurate True RMS measurements, NIST Certification of Calibration, LoZ for the prevention of false readings caused by ghost voltages, .5% basic accuracy, a 1000V AC/DC volt range, resistance up to 40MΩ, continuity beeper with visual alert, smart data hold, peak hold, auto power off with disable, relative mode for capacitance zero and offset adjustment. Additionally, the EX363-NIST excels in HVAC flame rod measurements with a µA function, as well as Type K Temperature measurements from -40 to 742°F (-40 to 394°C) and Frequency and Capacitance measurements.