Test batteries & step motor without opening the watch! This is the smart and simple way to test analog, quartz watches for mechanical defects and test for watch battery voltage. The Watch Analyzer actually allows you to find out, with reasonable certainty and without opening the watch, if the watch requires a battery change or watch repair. The Watch Analyzer, unlike competitive testers, will also test the coil. The Watch Analyzer is based upon the latest technology and is powered by a 9V battery (included).