The LTS 50-20 | 8000-6474 from Vitrek is a Laser Displacement Sensor with Measure/Sensing Distance 20 mm, Wavelength 670 nm, Resolution 0.382 µm, Supply Voltage 15 to 28 VDC, Laser Power <5 mW. More details for LTS 50-20 | 8000-6474 can be seen below.