My brother has had a PACT Model 1 chronograph for almost 20 years. This last winter it quit working. We sent it to them and 4 weeks later it showed up all refurbished with no bill. Still works as good as it did when he first got it. Here is a link to a new one at Midway USA;
Pact Model 1XP About 4 years ago I bought an RSI chronograph with a few extra goodies. It is totally expandable into a shooting labratory. I have used it some. I need time to put it thru the paces. We have not put the two end to end yet and copaired readings, but we will. Nice thing about having two is we can put one at the muzzle and the other at the target for actuall readings.
Here is the link to the chrony I bought.
RSI Chrongraph