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This TM800 proximity switch tester is designed to test 3 (Three) or 4 (Four) wires DC proximity switches with PNP and NPN outputs. This tester can be used for testing inductive (metal sensing), capacitive, photoelectric and ultrasonic proximity sensors, and allows the user to quickly and confidently check the operation of sensors, avoiding unnecessary replacement and adding fault finding functionality. The handheld pocket size unit comes fitted with 2 (Two) 9V carbon-zinc dry cell batteries and is ready to use.