The Electrical Test Probe tool eliminates the need for making your own electrical tester. Constructed with two sharp needles and a self-contained light bulb, the Electrical Test Probe can be used at any point along a conductive tape run for electrical testing or finding a tape run under wallpaper.
Simply push the needles into the copper strips and, if electricity is present, the enclosed bulb will light. Pin Spacing makes this handy tool usable with any tape system.
Design of probe may alter from picture