Bruce,
I use a Zonemaster II in tandem with an RH Stopclock Pro. AFAIK one would not use a Zonemaster with an Analyser Pro anyway because the Analyser already has a metering probe built-in. I suppose as long as your timer was able to exploit the accuracy of the Zonemaster, that is, to operate in times down to 10ths of a second (or finer) then there wouldn't be a problem. IMO, I think you'd be much wiser getting the Stopclock Pro which (when connected) automatically sets the time displayed by the Zonemaster.