... printer head. 2. Glasses and waterproof watch. 3. Metal jewelry like necklace, ring, earring and bracelet. The ultrasonic print ... washes precise electrical equipment circuit board and accessory such as mobile telephone , intercom , Walkman , to get extremly and thorough washing ... .The family applies:Daily things as the the gold ,silver,jewelry , headwear , brooch , glasses , watch chain ,pen , CD, ...