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 improving fault-finding efficiency. The tester is portable and powered by 2 x 6F22 9V batteries (battery included or not depending on selection). 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: The package includes only the items listed above; other products are not included. Note: Light reflection and differences in display screens may cause slight variations in color compared to the actual product. Measurement error allowance is +/- 1-3 cm.