The device is a tester for sensors. Provides the ability to quickly test for the performance of various types of sensors – NAMUR, two-wire key, three-wire and four-wire key, two-wire analogue, three-wire analog or current. Automatic detection of sensor type and output type. Small pocket size. Easily connect the cable to the tester. Light and sound indication. Built-in magnet and metal plate, enabling testing of inductive and magnetic sensors. Works with universal 1.5 V AA batteries. The device shuts off automatically when it is finished.