Ultrasonic jewelry cleaner with heater timer 700ml digital household ultrasonic cleaner for cleaning rings is a professional ultrasonic jewelry cleaner and it can be used to not only clean jewelries, but also clean other small stuffs with complex-surfaces, such as shaver heads, watch parts etc.and is characterized by simple, user-friendly operation. Based on the ultrasonic frequency of 42KHz, it can create more cavitation quantity, do much better in penetration, but cause much less noise than other devices whose frequencies are close to 20KHz 42KHz for intensive rinse of stuffs with complex-shaped surfaces. Under the same ultrasonic intensity, 42KHz ultrasonic wave can create more cavitation quantity, and do much better in penetration, than ultrasonic wave close to 20KHz. So 42KHz ultrasonic wave does well in cleaning stuffs with complex-shaped surface or blind holes. Especially, 42KHz ultrasonic wave causes much lower noise than ultrasonic waves close to 20KHz. 18 cleaning time among 90s~30minsThe default time setting is 90s and the time setting circulation is as follows: 90S→ 120S→ 150S→ 180S→ 210S→ 240S→ 270S→ 300S→ 330S→ 360S→ 540S→ 720S→ 900S→18 mins→21mins →24mins →27mins → 30mins→ 90S SUS304 stainless tank resistant to weak acid and weak alkaliSUS304 stainless steel does better in resistance to alkali solution and most organic and inorganic acid than SUS201 or other SUS200 stainless steel series. However, SUS304 stainless steel has no resistance to solution with chloridions, such as hydrochloric acid, and hydrofluoric acid. Note: Please don't use flammable, explosive or volatile cleaning solution. Suitable for multiple cleaning scenarios 1. Jewelry: Earrings, Necklaces, Rings, Bracelets and Diamonds. 2. Glasses and Timepieces: Glasses, Sunglasses, Optical Lenses, Contact Lens Accessories, Watch Chains and Waterproof Watches. 3. Tools of the Trade: Tattoo Guns and Tubes,