Utilizing a heavy duty cam and pawl mechanism, this reversible 1/4 in 3/8 in and 1/2 in. drive click type torque wrench is the go-to tool when precise torque is needed.Accurate to within +/- 4%. 1/4 inch Click-type, accurate within +/- 4% Heavy duty cam and pawl mechanism Torque range: 20-200 in. lbs. Reversible 3/8 inch Click-type, accurate within +/- 4% Heavy duty cam and pawl mechanism Torque range: 5-80 ft. lbs. Reversible 1/2 inch Click-type, accurate within +/- 4% Heavy duty cam and pawl mechanism Torque range: 20-150 ft. lbs Reversible