Bovidix 0300208 3/8-Inch Drive Window Scale Torque Wrench Square size: 3/8 inch. Torque range: 20 - 110 Nm (15 - 81 lb ft) Calibrated. Accurate to +/-4-Percent of the set load Reversible with a switch and torque in both directions Reliable and durable lock Fast, accurate and easy to set. Has easy to read window scale and micrometer scale