[supershaft]

I have used them before. I would much rather use a manometer on our bikes or cars. A Uni-syn is a manometer and a mechanical contraption in one. A manometer itself is neither mechanical or electronic. Therein lies their accuracy and simplicity. Why use a contraption when you can use THE scientific standard that IMO is not only more accurate but easier to use? I am just putting another angle out there for readers to ponder.