All Britool 1/2in square drive torque wrenches indicate with touch, sound and sight when the required torque is reached. Required torque loads are set by turning the sleeve until the required setting is opposite the mark. This Britool torque wrench range is distinguishable by a length independent mechanism, push through reversible mechanism and a retractable adjustment mechanism, which avoids accidental adjustment. The torque wrench complies with ISO 6789 and is supplied in a sturdy plastic storage case. Includes calibration certificate. The Britool BRIEVT3000A torque wrench 1/2 inch drive has the following specifications:Torque range: 70 -330Nm. 50 -250 ft.lb.1/2 inch Square Drive.32.1/2 inch Long.