This is a diagnostic tool for color televisions made by National (Matsushita Electric). It is a device that can measure signals, power consumption, synchronization, etc. of cathode-ray tube (CRT) televisions, and was used in repair shops at the time. It was at my parents' house, and I don't know when it was made, but the appearance is relatively clean. The needle moves when the power is turned on, confirming that it is powered. Only the items shown in the photos will be shipped. Please purchase only if you understand that this is a used item.