The sensor tester is designed to test two-, three-, or four-wire DC sensors with PNP or NPN outputs. Capable of testing inductive (metal induction), capacitive, optoelectronic, magnetic, or ultra sensors. Sensor testers allow users to quickly and confidently check sensor operation, avoiding unnecessary replacements and enhancing fault-finding capabilities. The tester is portable and powered by 2 x 6F22 9V batteries (battery included or not included depending on variant). Application: Optoelectronic, Proximity, Magnetic, Fiber Amplifier Type: A (Without 2 x 9V Battery), B (With 2 x 9V Battery) Color: Black Material: Plastic Size: 93 x 60 x 23 mm Package Contents: 1 x Photoelectric Switch Tester Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. Measurement allows an error of +/- 1-3 cm.