Measuring devices (option/other) are accessories for enhancing the functions of measuring machines, measuring devices with special applications, and related parts. Accessories include temperature sensors that are used while connected to measuring devices, and software for importing data from the measuring device to a PC to be saved and analyzed. Other parts include crocodile clips and versatile test leads. The measuring devices with special applications include current transformers, current signal generators and compact thermal imaging cameras. A current transformer is a device for transforming a large current into a small current. Other available devices include an electric tool insulation checker for determining the quality of the insulation condition of electric tools and checking whether the ground circuit is open or closed; an earth resistance tester used for measuring the ground resistance; and an automatic insulation withstanding tester that can control various settings from a computer.