Well I'm dabbling with watch making a little and am currently trying to restore a 1925 Elgin Pocket watch so I got a timegrapher. I found a very inexpensive option on E-bay for about $34. It was way cheaper than the common Weishi 1000's seriers. I couldn't find much info about it so I thought I'd share my experience here. There was one thread somewhere and someone chimed in saying they believe the sensors come from the same factory as the Weishi ones but take that for what it is, third hand...

New Timegrapher, inexpensive TGBC model from E-bay and test results from my collection.