... , Walkman , to get extremly and thorough washing.2.Glasses, optical instrument: After ultrasonic washing,all the things of the world obvious ... can solve all the problems.5.Clock and watch , precision instrument: Have ultrasonic cleaner ,you shouldnt Dismount screw , gear wheel , hairspring ... to give . Cleaner/ Jewelry cleaner/mini cleaner/Household Ultrasonic cleaner(GT-800)