... With overheating protection circuit Digital Ultrasonic Jewelry Cleaner Application: Suitable for laboratory, electronic workshop, mobile phone cases, water bottles, industrial water ... , necklaces, earrings, glasses, nozzles, watches, mobile, denture, experiment and equipment. Digital Ultrasonic Jewelry Cleaner Specifications: ModelJD-20Ultrasonic Frequency40 KHzTank MaterialStainless Steel ...