Applications Franklin Electric’s QD Service Box is a service tool that provides capability to measure motor amps and line voltage with the motor running. The QD Service Box fits between the base and cover of an installed QD Control Box. Features  Compatible with Any Franklin Electric QD or CRC Control Box Meter Jacks for Measuring Voltage While the Motor Is Running Clamp-on Ammeter Access to All Three Motor Leads for Installations with jacketed Cable or Conduit Easy to Use