Dual Scale Dial Calipers separates inch and metric scales and it has fine line indicating hands, easy to read black for inch and red for metric. With this scales we can measure four measurements inside, outside, depth and step. Measuring surfaces are precision ground and lapped.
Dual SCR Chassis controls two different DC motors either independently or in a ratio mode. Each side of the drive can be controlled differently with different trimmer pot settings and different speeds in independent mode. In a ratio mode, one speed potentiometer sets the main speed while the other one determines the ratio of the speeds between the motors.