Meter indicator with zero-setting removable wrench

Length counter with key reset. 6 digits + 1 decimal, height 8 mm - shaft D.7 mm - bilateral drive. Key reset. Rotation direction: 0 = clockwise, S = counter-clockwise. Maximum counting speed: 500 meters per minute. Overall dimensions: 92x80x50. Adds in one direction of rotation and subtracts in the opposite direction. Ratio 2:1 for wheels with 500 mm development (2 revolutions = 1 meter).