What is ultrasonic cleaning... It removes dirt by vibrating or mechanical energy. The impact sound pressure of ultrasonic waves causes a portion of the dirt to be peeled off, dispersed and emulsified and released. Small bubbles produced by ultrasonic vibrations penetrate between the dirt and the surface and the surface, and repeatedly inflate and contract with the change of sound pressure, and move forward to the layer of dirt will fall off. If you have a result of cleaning liquid itself with a mild detergent, this ultrasonic cleaning power will be significantly larger. There is no change in material discoloration due to chemical changes such as black silver products. Use a commercially available ultrasonic cleaner with neutral or weak alkaline. Water temperature is below 50℃. You can choose according to your use of ultrasonic cleaners. GTSONIC P2/P3 (2L-3L) Heater Model GTSONIC P6/P9/P13/P20/P27 (6L-27L) heaters, fans, and drain valves. Ultrasonic Cleaning Machine: Ultrasonic cleaning machine can be used for all kinds of purposes, and it has excellent power for precision cleaning. - Small Capacity Machine - Household applications: accessories, rings, glasses, precious metals, teeth, cosmetic brush, dentures, small foundation, seal, spoon, fork, watch metal band, electric razor blade, fountain pen nib... - Large capacity machinery - Industrial uses: tattoo shops, laboratories, golf clubs, antique merchants, electrical shops, laboratories, biochemistry, agriculture, machinery, electronics, surface treatment, semiconductors, watches, accessories, optics, spun dying, petrochemical industries and more. Cannot be washed: -Tortoise shell (glasses, etc.) - Precious metals, glasses and contact lenses with gemstones. - Ivory, stone, and wood - Watch body (waterproof included) - Gemstones (soft precious stones such as pearls, turquoise, opal, jade, emerald, coral and kohak) - Glasses and sunglasses with polarized lenses - Glasses lenses made of deterioration (crack, scratch, etc.) plastic - Glasses frame that may scratch or peel. Ultrasonic Cleaner Specifications: GTSONIC Ultrasonic Cleaner Features: Model Number: GTSONIC P20. Product Dimensions: Approx. 20.5 x 12.8 x 13.0 inches (520 x 325 x 330 mm). Dimensions of Tank: Approx. 6.1 gal (500 x 300 x 150 mm). Theoretical Tank Capacity: Approx. 6.1 gal (2 gal (20.0.0.0 L) (2 L) (2 gal (2 L) (2 L) (20.0.0 L) (2 mm) Material: Main Unit; Material: Main Unit: Stainless steel. 00W oscillation Frequency: 40 kHz Heater: 500 W Drain Included: Yes Fan Included: Yes Power Supply/Power Cord: AC 100 V - 120 V 60 Hz (50 Hz); Product Weight: Approx. 29.9 lbs (14.25 kg); Package Weight: Approx. 32.7 lbs (15.65 kg); Additional Functions: Heater function (80 °C / 1 °C / 1 °C / 1 °C / 1 °C / 1 kg) Accessories: Cleaning basket x 1 - 30 minute). 1 x Lid 1 x cable, 1 x instruction manual (English language not guaranteed).