Sonic's 1" drive Torque Wrenches are available in two sizes: 150-750Nm (110-550ft/lb) and 200-1000Nm (150-740ft/lb). The extra-long handles of the 1" torque wrenches provide more leverage for achieving these higher torque numbers. These torque wrenches work in a single direction, accurately measuring the force placed on a fastener in a clock-wise motion. The handle of the wrench turns to adjust the setting, with a magnifying lens built into the handle making the numbers easy to read. A knob at the end of the handle keeps it locked during use and easily pops out for adjustment for the next fastener.