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Josh - As mentioned above, you do not have to reset a split beam type.
Rob - I have a few of the Precision Instruments split beam type torque wrenches. My 1/2" drive, which has a range of 50-250 lbft, is adjustable in 2.5lb increments. That's only 1% of total capacity, and I haven't encountered any tech documents that call for greater precision at that torque. But your needs may be different. If you need more precision, I suggest the dial type torque wrenches. They also have greater accuracy.
Some other considerations:
Choose the right torque wrench for the job. A torque wrench has a sweet spot - an area in the range where the device is most accurate. Usually, it is around the middle of the range. So if you want to torque to 100lbft, don't choose a TW that has a capacity of 20-100. Choose one that has a capacity of 50-150 (or similar).
The higher the capacity, usually the worse the scale resolution.
For example, my 800nm Snap On dial TW reads in 20nm increments. That means that I could be off by as much as 10nm on any given reading.
Finally, DRO torque wrenches exist for those who cannot properly read a scale, or who want the ease and convenience of reading numbers directly.
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Last edited by cashflyer; 11-09-2010 at 01:15 PM..
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