I've been given a CARD pelletspy 1D chrono to put up for sale in the near future. So far I've powered it up and it seems to work but I've not yet fired a pellet over the sensors to properly test it (need to wait for some dry weather since I think it will require daylight). I was just wondering if anyone has owned or used one of these? Do they work well? I guess this item could be considered a collector's item. Any suggestions to the price it would fetch? The "1D" part of the name sounds interesting, anyone know what that is about? Were there several variants?