Klein Tools 2 Piece HVAC Meter Kit with HVAC Clamp Meter and Dual IR Probe Thermometer. Klein Tools CL320 Clamp Meter is an automatically ranging true root mean square (TRMS) digital clamp meter that measures AC current and NCVT via the clamp, AC/DC voltage, DC microamps, resistance, continuity, frequency, capacitance, and tests diodes via test-leads, and temperature via a thermocouple probe. The Klein Tools IR07 is a dual IR (infrared) thermometer and probe thermometer. This rugged pocket thermometer measures temperature from -40 to 572-Degree Fahrenheit (-40 to 300-Degree Celsius) for both IR and probe measurements.