●Comfortable and secure grip. With 1 reversible socket 17 x 19 mm and extension ●Tested and calibrated according to ISO 6789 and GS2019, accuracy +-4% ●Each torque wrench has an individual calibration certificate corresponding to the serial number on the torque wrench ●Each torque wrench is calibrated by a computer connected to the machine, then the test is passed by a technician and then a calibration certificate is issued