You almost never hear of a DC Watt Meter – one just does some mental math with Volts and Amps at the back of one’s head. An AC Watt Meter, on the other hand, can by pretty useful on any workbench.

World's most accurate power meter by Body Rocket makes sure no watts are left unread, Smith gets all nostalgic with new ...

This makes Bird meters highly desirable, and therefore quite expensive either brand new or on the swap-meet circuit. But radio amateurs are nothing if not resourceful, and building a homebrew ...