A laser sensor uses a “laser” to emit light in a straight line. Its visible beam spot makes alignment and positioning very easy. Since the light beam is focused, the sensor can be installed without worries about stray light. A light beam is emitted from the light emitting element (laser) in the transmitter and is received with the light receiving element in the receiver. Recab offers a variety of different types of laser sensors including reflective, thrubeam and retro-reflective models.