you could use because they wont lose calibration. The metal will fatigue, but not under the number of loads it is subjected to in its entire life. Shock springs sag after a while, but you know how much they get flexed in about 60-80K miles? I torqued 16 bolts to 90ftlbs and 8 to 70ftlbs for a total of 24 bolts. That's what, a trip to the grocery store? Its not often that you use it either.. I have built engine with it for me entire life - it is older than I am - it has never failed me. :)
: can fatigue over time and if it is ever bumped or dropped it is useless. Maybe we need to email snap on and ask them. This would be great trivia question LOL