Amprobe K-1 Current Sensing Probe is a versatile tool that allows you to quickly and easily measure AC Voltage and AC Current right through the insulation, without the need to strip or open a junction. This makes it an ideal choice for electricians, technicians, and homeowners alike. With its ability to accommodate wire sizes from 18 through 8 gage and its two current ranges (0.6 Amperes through 6.