Amprobe ST-101B Socket Tester

The Amprobe ST-101B socket tester is an outlet tester used to check and confirm the proper wiring of alternating current (AC) electrical outlets in residential settings. Three incandescent lights that indicate whether an outlet is correctly wired or the presence of five different wiring faults, including open ground, open neutral, open hot, hot/ground reverse, and hot/neutral reverse. The tester is designed to test 110 to 125V AC outlets and is UL and Canadian UL listed for safety. The ST-101B is used by electricians to test the wiring of electrical sockets in domestic and industrial settings.

Electrical test meters report electrical circuit properties, such as voltage, resistance, capacitance, and continuity. Available in handheld or benchtop models, they detect electrical problems in equipment, wiring, and power supplies. A variety of probes, clamps, or leads connect the meter to a circuit or device. Single-function meters, such as battery testers and voltage testers, measure one property of a circuit; multimeters measure multiple properties. Electrical test meters display information either in analog form using a needle that moves on a calibrated scale, or in digital form using digits or a graphic representation on an LED screen. Meter choice includes the electrical properties to be measured and the anticipated range of results, and should have a rating that is higher than the maximum value of the anticipated range. An electrical test meter has multiple settings that correspond to potential ranges of values for the properties it can measure. A manual ranging meter requires the operator to flip through different settings until the correct range is reached. An autoranging meter cycles through range settings automatically until it reaches the correct range.

Amprobe manufactures electrical testing equipment for commercial, industrial, and home use. The company was founded in 1948 and is headquartered in Everett, WA.