The Witschi Watch Expert III is based on our new measuring technology, called Chronoscope. The instrument offers the watchmaker all possibilities for testing mechanical watches. A diagram of the watch beats is presented completely silently on a LCD graphic display panel. Numeric values for the rate accuracy, amplitude and beat error are automatically calculated and displayed numerically, i.e. the diagram no longer has to be manually evaluated. Operation for conventional watches is largely automated. The measurement parameters can be manually selected for special watches or for special measurements. With the new measuring mode, watches with a special escapement system can also be measured.