BST-9050 0.5L 220V Digital Display Mini Ultrasonic Cleaner1. With digital display. 2. Ultrasonic Cleaner is designed for powerful professional grade cleaning to remove dirt, oil and grime from your valuable items including jewelry, eyeglasses and instruments in minutes without damaging them. 3. It is applicable to glasses, watches, jewelry, the metal article, metal dishware, stationery and daily used, ideal for jewelry shops, eyeglasses shops, watch and clock shops, dental clinics, mobile phone shops, office