Greenlee CM-860 AC Clamp Meter with AmpTip is a versatile AC clamp meter that measures AC current, AC/DC voltage, resistance, capacitance and frequency. Greenlee CM-860 is designed with AmpTip technology which features a smaller opening at the top of the clamp jaw for taking more accurate readings on small wires or low current, and has a digital low pass filter for accurate readings on variable frequency drives.