Jiangyin Yangfan Ship Trading Co.,Ltd is one of the best quzrtz chronometers manufacturers and suppliers in China, you can get quzrtz chronometers free sample and buy discount products from our factory.Highly accurate quartz crystal timekeeper. Water-resistant and unaffected by humidity, shock, and magnetic force. The clock will still operate when replacing the battery on a 40 hour back-up battery.370207Chronometer quartz 184*215*76 mm Weight：2.2 kgsPc.