Proto tools typically have a serial number stamped near the square drive. If no number exists, and the finish is poor, contact Proto’s anti-counterfeit department. Do not use the tool.
The J6342 is calibrated at the Proto factory in the USA. The manual states that initial accuracy is ±4% of reading. proto j6342 user manual
The Proto J6342 is built with a chrome-plated alloy steel body and a patented rotary bezel for multi-angle viewing. Specification Torque Range 10–100 in-lbs / 0.8–8.3 ft-lbs / 1.1–11.1 Nm Accuracy ±1% CW and CCW (valid from 10% to 100% of full scale) Display LCD with rotary bezel (rotates up to 359°) Power Source Standard 9V battery Length Weight ~1.4 lbs (2.57 lbs shipping weight) Operating Instructions Go to product viewer dialog for this item. Proto tools typically have a serial number stamped