People were commenting several months ago that they could not get the Kello watch regulation app working, and agreed it was a dud. I suggested they not try and time a watch movement through a closed case back, but I don't think anyone noticed.
My new (used) asian Fiddy was running -3 mins a day and damn if that did not suck so I opened the case back and tried out Kello on it. It worked fine. Not a tool that can replace a vibrograph, obviously but useful none the less.
I set it roughly and will re-time it in 24 hours when I see how it's gone.