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i would invest in multiple torque wrenches. buy them as you need them. initially, but one that is most useful the most often (i.e.- a 0-100 or 0-150 ft lb tq wrench, for torqueing wheels, etc.
all tq wrenches have a margin of error from the factory (+/- X%) and all torque wrenches must be recalibrated.. not sure where you could get that done in the civilian world?
beam/gage type wrenches are said to be the most accurate as well as the least prone to damage once dropped (of course we don't want to drop them on purpose but it happens.)
the the internals on the micrometer/click type wrenches are more prone to damage once dropped, and are also more prone to erroneous readings from the start.
out here in the quality assurance world of the submarine, we actually have a procedure in which you have to exercise a micrometer torque wrench 6 times at 60% before you can use it (to get out any errors.) this is done by placing a nut/bolt in a vice, setting the torque wrench to 60% its total capacity (i.e.- our 250-1000in/lb tq wrenches are set to 600in lbs and then torque is applied to the nut/bolt in the vice until the torque wrench 'clicks', then do it 5 more times.
probably a little more information than is needed sorry, its somewhat a favorite topic of mine
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formerly known as "hotboiblaze"
ratsun: dawa (73 datsun 620)
clublexus: properD (97 sc300)
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