Wiha Tools’ noncontact voltage tester features LEDs that will light up blue (weak), orange or red (strong), depending on the strength of the alternating electric field. An integrated flashlight allows the user to illuminate the measurement point in dark environments and can be switched off and on manually for use solely as a flashlight.

Klein Tools’ NCVT7 noncontact voltage tester has a bar graph display that shows signal strength, with more bars lighting up as voltage increases or the detector gets closer to the source. An audible alert adjusts its rate to match the bar graph, increasing or decreasing accordingly.

Amprobe's VPC-10A handheld residential and commercial voltage and continuity tester measures AC and DC voltage in circuitry and its components, including outlets, light fixtures and extension cords, while testing the continuity of fuses and light bulbs. Seven LED indicators differentiate voltage levels.