To perform an input operation of measurement data in a single operation, improve the working efficiency, and prevent entry mistakes.

Communications functions is added to a clamp meter and to a remote temperature measuring instrument. When a data-hold button of the clamp meter or the like is depressed, measured values are automatically transferred to a personal mobile terminal. Forms are changed by a personal computer installed in an office by using a spread sheet program. The personal mobile terminal is allowed to use the same format to simplify processes.