... head,Crawler, Display controller,Cable Reel, Wheel, System Control Software etc Pipe inspection: Robotic crawler:Model: SD-9902Brand: SLD ... in different sizes2. Can turn left and right, forward, backward3. Stepless speed regulation function, 0-35 M ... numerical, auxiliaryilluminant brightness numerical, slope.2). Control function: forward, backward, turn left, front camera axial rotation, level ...