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 ultrasonic 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 two 6F22 9V batteries (included). Application: Optoelectronic, Proximity, Magnetic, Fiber Amplifier Type: B (With Battery) Color: Black Material: Plastic Size: 93 x 60 x 23 mm Package Contents: 1 x Photoelectric Switch Tester Note: The package includes only the items listed above; other products are not included. Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement may vary by +/- 1-3 cm.