The Triplett Sniff-It 3 (9606) is a high-performance AC voltage detector with adjustable sensitivity that has a wide measurement range of 25 to 1000ACV, Dual Color Tip to indicate low/high voltage, built-in flashlight, and durable over-mold. The high sensitivity allows it to detect low voltage AC wiring commonly found in doorbell circuits, thermostats, control circuits, and video surveillance camera power. The Sniff-It 3 is designed for industrial applications with its impact and drop resistance in a sleek ergonomic design, and the easy to use thumb wheel helps dial-in detection range. CAT III safety rating. Includes (2) AAA batteries. Founded in 1904, U.S.-based Triplett Test Equipment continues to be on the leading edge of specialized testers. Whether supplying vital test equipment to the U.S. Signal Corps during WWII, or providing the railroad industry with essential testers to ensure the safety of their crews and the public, Triplett prides itself on developing innovative, reliable, and durable test equipment that also won't break the bank. Triplett's catalog contains a wide array of test equipment parts and accessories such as multimeters, voltmeters, cable testers, security cameras and security camera accessories, wire cable mapping kits, video monitors, and other specialty testers. They serve industries such as HVAC, security, electronics and electrical, telecom, and more.