This Norbar NorTorque® Tethered Torque Wrench has the following specification: Drive: 1/2in Square Range: 20-100Nm (20-80 lbf.ft) Accuracy: ± 3% Ratchet Diameter: 38mm Weight: 0.9kg The Norbar NorTorque® Tethered Torque Wrenches are accurate up to ± 3%. They feature a built-in tethering point to secure the tool for safe work at height and a double-sided locking plunger square. Built on a trusted, versatile torque wrench design with a micrometer scale for simple and error free setting. The handle and lens materials are resistant to commonly used industrial chemicals. The lock feature helps to prevent accidental adjustment of the set torque. Pinned head in line with DROPS recommendation for ultra-safe handling of sockets when working at height. Supplied with a Declaration of Conformance, which meets the requirements of ISO 6789-1:2017.