The Heathkit PM-2 mobile tuning meter is a sensitive portable instrument for the measurement of relative power output of mobile transmitters. The signal radiated by the transmitter supplies the necessary operating power and no other power is required.
While this instrument is designed expressly to serve as a mobile transmitter tuning meter, the PM-2 finds application in fixed station use as well as an output indicator for any transmitter. The magnet on the bottom is incorporated to secure the unit to any metal surface.
I have this meter in use and sitting right on top of a power supply in the radio room. It is fun to watch it waving to me during transmissions. The more idiosyncrasies on a piece of electronic gear or at the operating station in general the better.