... V-KOOL special ultrasonic cleaning,watches,precision instruments,eliminating one by one removable screws,gears,springs spring,bracelets and other trouble ... pen,pen,brush,spray often blocked,seals are often obscured by inkpad of buildup,commonly used WELGO special cleaner can ... and other electrical appliances,precision circuit boards,parts used. easy to use eyeglass ultrasonic cleaner,can be customized