I agree with Larry, a beam type torque wrench will work very well and at the least cost for a good new one (a beam type has the long pointer attached to the head and extends to the handle where a graduated gauge is located, as the bolt, nut, fastener is tightened the beam/pointer indicates the amount of torque that is being applied). If you can find a click type torque wrench at a reasonable price, then they are a bit easier to use. As jsmith wrote, flea markets may be a good place to find either kind of torque wrench at a reasonable price (as well as pawn shops, garage sales, companies selling used tools/equipment, etc., etc.).
Torque wrenches come in various calibrations (inch pounds, foot pounds, kilograms, etc.) and range of torque they will measure (for example: 0-600 in. lbs., 0-150 ft. lbs., 50-250 ft. lbs., etc., etc.). Some torque wrench gauges will have more than one calibration (both foot pounds and kilograms is one). So, you will need to review the torque specs. for the fasteners you will be using and select a torque wrench accordingly (as well as considering possible future needs).
Your choice will depend on your needs. If you are torqueing fasteners with low torque specs., then you will want one measuring the lower torque ranges more precisely (say 0-600 inch pounds which equals 0-50 ft. lbs., recall 12 in. lbs. = 1 ft. lbs.). If you are using fasteners with middle to higher torque specs., then a 0-150 ft. lbs. torque wrench is a good all-around choice because it is very versatile. MB uses Newtons per meter (Nm) as their method of measuring torque/force applied to fasteners (1 Nm = .74 ft.lbs. = 8.8 in. lbs.).
Another consideration is the size of the torque wrench's connector (1/2" or 3/8") and the size of the sockets you own. Whatever your choice of torque wrench, you should buy an adaptor to fit both 1/2" and 3/8" sockets (a 1/2" to 3/8" adaptor if you buy a torque wrench with a 1/2" connector as is common on the 0-150 ft. lbs torque wrench, or a 3/8" to 1/2" adaptor if the wrench has a 3/8" connector), that is if you do not already own adaptor(s).
Hope this helps.
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