UFP: Universal Footswitching Port ... large single pin socket (for large single pin plug - or jack plug - sometimes known as the "Bovie").
For some reason (probably nothing more than "tradition"), these are found on almost all electrosurgical units.
I would attach an image if they were available to this thread!
Re: test equipment ... yes; that has always been the problem with testing ESUs. It seems that every manufacturer has his own ideas. Not to mention his list of "must have" (expensive) test equipment. Not so bad if you're only serving a single hospital (or group of hospitals using the same ESUs), but a real headache when supporting equipment in many and various locations (each with their own favourite ESUs). A few years ago one manufacturer was talking about testing and calibration procedures that required current sensing transformers. Apparently, that was the "only true way" of measuring the RF output(s). What we need is a truly universal approach!