Ugh.... I am about to give up on this this. I bought a used CED millennium chronograph a few months back, and can not get it to work. I took it out and set it up per the instructions, I fired shots from various guns and could not get a reading. I have tried close up and far away, with and with out the screens on, switching the start and stop cables.....The read out just shows 0000. I have tried the "flash light" test at home and it reads fine, so I think the sensors are okay. I just don't know what else to do.... HELP.