Torque Wrench???

I have had a 1/2" for years (MATCO I think), but there are a lot of lower torque values that are needed, so I picked up the 1/4 and 3/8 at Harbor Freight. I would think the 'tool truck' wrenches would be best quality, or even old Craftsman, but if buying used may have had a hard life and need recalibrated. I had my 1/2" calibrated shortly after I got it and have not used it much. I did try to test the HFs against each other on the same bolt by finding a value they could both do and they seem to be pretty close - of course they could both be wrong...