Stanley Proto J6066CXCERT 3/8-Inch Drive Ratcheting Head Micrometer Torque Wrench, 200-1000-Inch Pound Calibrated to +/- 3% in clockwise direction and +/- 6% in counter clockwise direction Calibrated to +/- 3% clockwise direction (for J6060A, calibrated to +/- 4% clockwise direction) Certification documents traceable to N.I.S.T. (National Institute of Standards and Technology) Manufactured to meet precision/highly accurate applications such as military and aerospace