... the surface oxidation process8. Weight: 0.5KG Rear camera and secondary light source1. 1/3 SONY CCD ; 520TVL resolution; ... the data of running speed, ditance, crawler internal, and camera internalpressure index, two axis Angle measurement, lighting source ... , operator information, air pressure,slope, dip angle, speed and distance information4). Management function: user password input, modify; ...