... tray, boiler, bottles, bottle cap, filters,etcOptical& watch makeroptical lens, eyeglass, sunglass, metal, gold, jewelry, diamond, watch band, watch ... :all optical lenses,such as varies glasses(including contact lenses),magnifying glass,binocular,microscopes,cameras,video cameras ... appliances,precision circuit boards,parts used. plastic eyeglass ultrasonic cleaner with digital timer display