Battery testers; Circuit testers; Connecting electrical cables; Digital multimeters; Electric wire and cable; Electrical terminal blocks; Electrical voltage tester pens; Electronic and optical communications instruments and components, namely, communication link testers for testing communication links; Electronic sliding callipers; Infrared detection apparatus; Laser rangefinders; Rangefinders for golf; Voltage testers; Welding transformers; voltage, amperage, telephone lines, continuity testers