ultrasonic cleaning machine 1.Clean watches,Jewelry,necklace, eyeglass,etc 2. ... 3..Easy to operation Jewelry and watch ultrasonic cleaning machine1, Uses: 2 ,rinciples: 3, Features: Ultrasonic working time 1-30 minutes arbitrary adjustable ... long hours, suitable for different occasions; Using high-quality imported components, ultrasonic power conversion efficiency, the power strong, clean effect is ...