The Megger CJ-90090 Calibration System Kit is an optional accessory for use with the BVM Battery Voltage Monitors. The BVM Cal Box Kit is designed for the calibration of the Megger BVM instruments. It includes an AC Adapter, Power and Signal Connector, Control Cable, Extension Cable, Test Cables, Transport Case and USB Memory Stick. The USB stick contains the BVM calibration software and the user manual. There are two folders in the USB drive—Agilent and Keysight—and they can be selected according to the DMM the user has.