Question: what is the difference between 1/2 and 3/8 torque wrench?
Answer: The 1/2 drive has a larger scale, ranges from 25 ft/lbs to 250 ft/lbs. The 3/8 drive has a larger scale, ranges from 10 ft/lbs to 100 ft/lbs. Most of my torque wrench uses require the 3/8 drive torque range.