Baumer Ltd. offers the series O500 qTeach optical sensor. Touching the teach-in surface with any ferromagnetic tool, such as a screwdriver, is enough to program the sensor. A blue LED light provides clear optical feedback, and to prevent user errors, qTeach locks autonomously after five minutes. In contrast to conventional mechanical pressure switches, Series O500 qTeach has no moving parts which fully eliminates any signs of long-term wear.