The Amprobe VP-600SB Non-Contact VoltProbe is a non-contact voltage tester that detects alternating current (AC) voltage from a distance of 0.16" (4mm) for safe evaluation of cables, circuit breakers, wall sockets, junction boxes, and other electrical wiring. This average-sensing tester helps provide accurate readings when measuring linear loads with a current or voltage that has a sinusoidal waveform. The tester illuminates red, vibrates, and beeps when it detects AC voltage and operates from 100 to 600V. It is powered by two alkaline AAA batteries and meets European Standards (EN) 61010-1 Category III 600V. The VP-600SB is designed for use by electricians, electrical contractors, and auto mechanics.Specifications Power supply AAA batteries (two, included) AC voltage range 100 to 600V Weight (including batteries) 1.7oz./49g Safety standard met International Electrotechnical Commission (IEC)/European Standards (EN) 61010-1 Cat III 600V Dimensions 5.2 x 1.1 x 0.9 inches / 132 x 28 x 23mm (H x W x D) H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.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.