Norbar Pro 300 Adjustable 'Mushroom' Head Torque Wrench 1/2in Drive 60-300Nm (Model 15005) The New Professional torque wrench has been re-engineered to be even more precise, strong and easy to use. The square drive features a finger grip on the top ('mushroom' head) that assists with running down the nut until resistance is met. Features: Factory calibrated to +/-3% and our new mechanism ensures that the accuracy is retained for longer Every wrench is supplied with a calibration certificate to satisfy the requirements of ISO 9000:2000 Ergonomic new handle with a high proportion of soft-feel, high grip material Handle material and lens resist all chemicals in common automotive, industrial and aviation use Secure push/pull locking mechanism is quick and intuitive to use and prevents accidental adjustment Large scale window and long scale length for great visibility and accurate setting Unique on a torque wrench, the TimeStrip gives a visual indication that the wrench is due for re-cali