Torque wrenches can be purchased at any hardware store like Home Hardware or Canadian Tire. Torque wrenches can also be found at big box stores that sell tools like Sears.
Yes, there are inch/pound torque wrenches.
Hydraulic pressure has nothing to do with torque wrenches.
Before torque wrenches you simply had to judge the amount of force you used by the 'pull' you exerted on the wrench.
Torx or Allen wrenches get more torque (pressure) on the bolt.
Don't know what you mean by "set up". Torque wrenches come ready to use. Attach a socket and go to it.
GearWrench is a website that sells tools. These tools are mainly automotive like torque wrenches, pliers, wrenches, screwdrivers, nut drivers, and specialty tools.
Torque them to 35 pounds. then after it has run and cooled off torque them again. You can rent torque wrenches from some parts stores
Ratchet wrenches work well.
To tighten a bolt to 30nm you would need to use a metric torque wrench. There are digital torque wrenches that can switch from standard (in-lbs, ft-lbs to newton meters).
Hydraulic torque wrenches are manufactured with some initial and flexible settings which allows to assume the right torque level over particular venture on using it. There is no specific torque level exhorted, its always good to start from the minimum setting later raise up.
Jobs that require a pneumatic torque wrench include jobs that require mechanical work. This includes car mechanics, which use these wrenches to change lug nuts on a wheel.