One more question if you don't mind . My Zonemaster does not transmit the 7 test print times to my Stopclock Pro via the 3.5mm jack. I am wondering if this is normal or if the later models have this feature.[/QUOTE]

think it does transmit it, but the button on the ZM does'nt work when you connect to the StopClock. In stead you activvate the test procedure from the StopClock itself, do you have the manuals? If not see RHDesigns website where you'll find everything.
Peter