I just bought an old stock/new Torque Screwdriver for $33 from an eBay Surplus Dealer. A Sturtevant Richmont CAL 36/4. See:
It is basically new, just been on a shelf somewhere collecting dust. Wanted it for mounting scopes on springer air guns which are notorious for moving them around during use. I'm no stranger to tightening small screws but didn't want to risk crushing the scopes either. For some discussion see:
I used this model at work for many years for torquing down RF shields in radios. It worked flawlessly, never had any trouble with it. Really pleased to come across this buy :)
Torquing the shields in a uniform manner was recommended to minimize microphonics in certain models. The RF shields covered the synthesizer/modulation area. The old Motorola Mostar/Traxar line had several problem areas...
Found some charts and tips on recommended torque values:
I never had any trouble with mounting scopes in the past but I suspect the older ones had heavier tubes than what is being turned out today. I wasn't mounting them on guns well known for beating up scopes either...