Tighten set screws with this precision torque wrench. Mechanical design does not require batteries and all steel construction has no plastic parts to break or wear out. Read in inch, pounds, or Newton meters. Reversible ratcheting head that drives fasteners in both directions and measures torque in the clockwise direction. Wrench emits a click that can be heard and felt when the preset value is reached. Ships pre-calibrated to +/-4% and ready to use. Store at its lowest setting when not in use.