1/2\" square drive digital torque adaptor supplied with calibration certificate The Sealey STW290 is designed for use with a standard ratchet or breaker bar, ideal for tightening wheel nuts to factory specifications. This model has a 1/2\" square drive and a range of 40-200Nm. The large LCD display with LED/audible alarm indicates achieved and target torque levels. Features:   Designed for use with a standard ratchet or breaker bar  Ideal for work around the engine bay and the tightening of wheel nuts to factory specifications  Large LCD display with LED/audible alarm indicating achieved and target torque levels  Selectable readings in Nm, lb.ft, lb.in, kg.cm or kg.m and accurate to ±2% of stated capacity  Memory stores up to 50 readings and features auto shut off after 80 seconds   Comes With:   Calibration certificate  Storage case Specification: Drive: 1/2\" Sq  Length: 75mm  Range: 40-200Nm(29.5-147.5lb.ft, 354-1770lb.in)  Battery: 1 x CR2032 (Supplied)