Servicing or Repairing your watch with us Your watch is tested with our latest tools for reliability. Listed below are some of the state- of-the art tools to measure the accuracy, tightness, and other elements that affect your mechanical watches. The ChronoProof PRO is used by specialists to execute all types of tightness tests on wristwatches in a reliable way. As the world‘s first and only seal testing device with an integrated compressor, it is particularly compact and practical in daily use. Thanks to the integrated printer you can also have the test result in black and white. Servicing or Repairing your watch with us Your watch is tested with our latest tools for reliability. Listed below are some of the state- of-the art tools to measure the accuracy, tightness, and other elements that affect your mechanical watches. At Drago, we are passionated in watches and we strive to keep our tools up to date for highest standard of repairs.