I bought a couple of inexpensive ones on ebay SMA & 3.5 for around $40 each. They seemed accurate and repeatable.
These are useful when connecting between systems with RF cables.
However when working on tight spaces
inside a piece of test equipment it seems like all bets are off to get a torque wrench on many connectors. A good example is trying to replace the ACLU on an HP 8566. It's on an assembly with 2 other RF components in totem pole arrangement.
Maybe there are some good suggestions and tricks for getting torque wrench to work in tight spots. Usually your lucky to find a or make a basic non torque wrench that will fit.
rastro