Going over the timers I aquired, it looks like one may be off a bit. Finding an accurate AND trustworthy souce of time is easier said than done. It got me thinking about a solution. A small box that plugs into the enlarger outlet on the timer and starts counting, with 0.01 second resolution up to 99.99 seconds, when the circuit is energized. Obviously it would stop counting when the circuit is turned off. This could also be used to check shutter calibration as well. A way to change the time scale to one with 0.0001 seconds resolution and different adaptor and it should work for that. Does anyone think that this would be commecially viable? If so, would you buy one? How much would you pay? What would be an acceptable margin of error?