http://www.ebay.com/itm/Watch-and-P...710?pt=LH_DefaultDomain_0&hash=item5d3c9a8776Purchases made through these links may earn this site a commission from the eBay Partner Network I have nothing to do with the listing This timing machine will automatically calculate in real time for the following: -beat rate -Amplitude -beat error -beat number 110v-240v AC Adapter is included Automatic selection are available for the most common beat: 12000, 14400, 18000, 19800, 21600, 25200, 28800, 36000, 43200 Manual selection are available for the following beat: 3600, 6000, 7200, 7380, 7440, 7800, 9000, 9100, 10800, 11880 12000, 12342, 12480, 12600, 13320, 13440, 13500, 14000, 14040, 14160, 14200, 14280, 14400, 14520, 14580, 14760, 14850, 15000, 15360, 15600, 16200, 16320, 16800, 17196, 17258, 17280, 17786, 17897, 18000, 18049, 18514, 19332, 19940, 19800, 20160, 20222, 20944, 21000, 21031, 21306, 21600, 25200, 28800, 32400, 36000, 43200
AFAIK they're chinese versions, I think Al made mention of them a while back, and how really you need a good timing machine and someone trained to professionally use it to get any decent results
I found it useful to filter out potential bad watch movement or to check when a watch need service. It is also fun to play around with. However to get proper result, it is a little bit cumbersome ( check here: http://omegaforums.net/threads/2-new-essential-tools-coming-this-month.3954/). PS: most of the time I don't strictly follow professional rules.
You get what you pay for. They are fun to muck around with. I use them like Privateday - to screen incoming purchases to see if they are in fact "just serviced"