The norbar model 650 professional torque handle with a 22mm spigot is an upgrade to the model 550 and has the same high quality and accuracy as the model 60 330 professional wrenches with an accuracy of 3 of reading all international standards for torque wrenches are exceeded every wrench is supplied with a calibration certificate to satisfy the requirements of iso 90002000 the positive click can be heard seen and felt so you know you have reached the right setting and it has a long scale len