I have 2 different HF torque wrenches 3/8" and a 1/4", i tested them against a digital snap on torque wrench at my work and the 1/4" on in inch pounds was really close, i say with in 1 to 3 inch pounds of what the digital one said. The 3/8" one was 5 to 8 foot pounds over across the board. So i use mine with that information in mind. Now in their defense we tested 2 other wrenches on hand a craftsman and a gearwrench and the HF one was far more accurate then the craftsman and about the same as the gearwrench.