I had a Pact - for about a day. It flat would not work and when I called the number they strongly recommend you call with problems and told them my range faces west and the light was behind me, they told me to turn the unit so the light was onto the photocells. When I advised the guy that doing so would have the chronograph positioned across the range, he said, "You gotta do what you gotta do." I did - I returned the Pact to MidwayUSA.

I then bought a CED M2. It worked when it felt like it and numerous calls to their office not too far from me finally resulted in my speaking with the head engineer, Charles. Over the course of weeks, Charles sent me a complete new M2, piece by piece, but the results were the same - my old ProChrono would always work but the M2 was intermittant.

I returned that one to CED and bought another ProChrono with the Bluetooth connectivity. It always works!

Ed