I did a poor mans test on mine a few years ago by locking the 1/2" (or 3/8", I don't have a 1/4" torque wrench) square drive end in my bench vise and then hanging various weights on the pivot point of the handle. The weights were "calibrated" by putting them on a digital bath scale. Had to do a little simple math because the length of the wrench isn't 12". Both wrenches were within 3 foot pounds of being right from 20 to max for the wrench.

'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.