Martindale VIPD kit contains a VI13700/2 voltage indicator, PD440 proving device, TC57 carry case and 6 x AA alkaline batteries. PD440 is a battery powered proving unit for the testing of contact type voltage detectors up to 440 V at 500 kΩ load or higher. The soft carry case TC57 has a neck strap and clear front pocket with two holes for using the proving device in-situ.