The Fluke 378 FC is a true-rms clamp meter that use FieldSense technology to make testing faster and safer, all without touching a live conductor. You get accurate voltage and current measurements through the clamp jaw. Simply clip the black test lead to any electrical ground, put the clamp jaw around the conductor and see reliable, accurate voltage and current values on the display. The 378 FC clamp meter also includes a unique PQ function that will detect and display power quality issues, relating to current, voltage, power factor or any combination of the three.