An input tool has: an I/O unit having a digimatic interface; a first signal conversion unit that converts a measurement signal in a signal format according to an HID keyboard protocol capable of being processed by an HID driver; a second signal conversion unit that converts the measurement signal into a signal format according to a virtual serial port protocol capable of being processed by a VCP driver; a conversion controller that makes one of the first signal conversion unit and the second signal conversion unit to convert a signal format of the measurement signal; and a USB communicator having a USB interface that is connectable with a PC, the USB communicator outputting the measurement signal.