From: kraken.sankey@gmail.com   
      
   I also have a Rubidium 10 MHz reference generator from ebay.   
   >>>>   
   >>>> I think maybe use a 10 MHz piezo mounted against the watch as detector?   
   >>>> There are several piezo sensors for that frequency,   
   >>>> From:   
   >>>> https://duckduckgo.com/?q=10+MHz+Piezo+sensor   
   >>>>    https://acs-international.com/instruments/transducers/pi   
   zoelectric-1-10-mhz/   
   I've ordered 5 of those to play with. I bought a 'watch' tester from   
   ali, stripped out and saw it had a piezo strapped across 2 metal pins   
   that the watch is held against. These seem to be designed for quartz   
   analogue watches- the app detects the missing motor pulses to correct   
   the time..( as opposed to 'pulling' the crystal like they did in the old   
   days)   
     In the box, the piezo is connected to an LM386 ( !) and a USB comms   
   chip to send data to the app. I can play some more now.   
      
      
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