Robot calibration is the process of identifying the real geometrical parameters in the kinematic structure of an industrial robot. This book compares different robot calibration methods used in the industry with different measurement systems (laser trackers, stereo cameras, touch probes, ...). This work introduces easier and more affordable robot calibration methods, such as calibrating robots with a telescoping ballbar. The robot calibration methods described in this book are the same methods used in RoboDK, a software tool for offline programming, robot calibration and robot performance tests, including the ISO 9283 tests.