Chris,
Mechanical torque wrench with such relatively large range, 20 to 150 inch-lbs. , will not be accurate and "sensative" enough
to be suitable for scope caps screws, although it should be all right for action and barrel screws in the range from, say, 45 to 145 inch-lbs.
If you do not need more than 72 inch-lbs., then Borka Tools MG torque driver will cover all your needs.
If you're interested, I also recommend you to look at Triad Tactical, as Steve from Triad carries the full line of Borka Tools products, same selection of products as directly from Borka Tools.
http://www.triadtactical.com/Borka-Tools/
There is a list of other dealers on
www.borkatools.com, so you can also choose the vendor according to your preferences.
If you prefer adjustable torque screwdriver for scope caps screws, get one of the brand names, like CDI, Mountz or above mentioned Snap-On, which is simply a re-branded and slightlly more expensive CDI. For action screws, assuming that you're using 65 inch-lbs., take a look at Borka Tools PTL-065-IP, which is an extremely accurate and durable 65 inch-lbs. torque tool, less expensive but much better quality tool that Seekonk T-handle.
Boris
Borka Tools