... field monitoring, detection field.2, FTM series laser displacement sensor applications1, reflector measurement of various objects in the distance; ... ,4-20mA,PNPSize10mm & 30mWeight40X60X173mmmeasuring range300g6, FTM series laser displacement sensor device maintenance and maintenance 1, clean and dry. 2, ... dust on the mirror. 3, please do not contact lens with your fingers. 4, apply a clean soft cloth ...