I have a PACT chronograph that I bought ~20 years ago. As of this last weekend it still works and gives me the data I want.
I had one that lasted 20 years ago and finally gave up. The parts are no longer available. It was reliable to say the least.
They have a lifetime guarantee.Ship it back to PACT.They will fix or repair it.Mine (20 + years old} went cowchit.I called their number for CS and he told me how to fix it.The keyboard was not working.All I had to do was take it apart and use an eraser on the boards contact points.Up and running again.