The AR700-2LR from Acuity Laser is a Laser Displacement Sensor with Measure/Sensing Distance 50.8 mm (Span), Wavelength 660 to 670 nm, Sampling Rate 0.2 to 9400 Hz, Resolution 2.6 µm, Supply Voltage 15 to 24 VDC. More details for AR700-2LR can be seen below.