Abstract: A limit switch calibration checking device for a limit switch assembly of the type having at least one upper limit switch, at least one lower limit switch, and a limit switch mechanism that controls the upper and lower limit switches in response to movement of an input member. The calibration checking device includes a drive member adapted to engage the input member to drive the input member, a motor coupled to the drive member such that the motor is operative to move the drive member, a position indicator coupled to the drive member to measure travel of the drive member, and an electrical control circuit responsive to the upper and lower limit switches and operative to control the motor to automatically stop the motor in response to switching of a manually selectable one of the upper and lower limit switches. The disclosed calibration checking device can be used to measure the initial position of a limit switch and the travel required between the upper and lower limit switch points.