A non-contact voltage tester serves as a key component in any electrical toolkit, allowing the user to verify the presence of AC voltage prior to working on an electrical installation or during troubleshooting without requiring physical contact with live electrical conductors. Engineered to specifications required by professional electricians the Sperry Instruments VD6509 adjustable non-contact voltage detector allows for sensitivity adjustments in multiple-wire applications when precision and safety are crucial. This unit features an adjustable sensitivity dial able to detect the presence of AC Voltage from as low as 12 V to up to 1000 V AC and provides both audible (beeping) and visual (360 deg flashing red light) indicators to alert the user of the presence of voltage. It also includes a built-in flashlight. The fully insulated probe tip eliminates the risk of contacting live electrical wires while the patented battery check feature designed into the unit ensures tester and batteries are operating properly, virtually eliminating false negative readings. This unit features 250 lb crush rated impact-resistant ABS housing to withstand tough worksite applications while the design ensures a positive user experience over long hours of repeated use. Applications include testing doorbells, low voltage lighting, security system wires, AC energized wires, quickly locating hot terminals in receptacles, pinpointing breaks in wires and detecting the absence/presence of voltage at outlets, circuit breaker panels, light fixtures, switches and motors. The unit includes a pocket-clip for secure portability. Operates from a single AAA battery (included). Frequency 50 to 60 Hz.