Ultrasonic cleaning principle: Ultrasonic cleaning: This product 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 the cleaning liquid itself has the effect of removing dirt from a mild detergent, the effect of this ultrasonic cleaning will be significantly larger. It does not affect the color of the material due to chemical changes such as dark spots of 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. VGT-1613QTD/VGT-1620QTD/VGT-1730QTTD (1.3L-3L) Heatered Models. This model includes a VGT-1860QTD/VGT-1990QTD/VGT-2013QTD/VGT-2120QTD/VGT-2227QTTD(6L-27L), heater, fan and drain valve. 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. GT SONIC Ultrasonic Cleaner Specifications: Model Number: VGT-1730QTD; Product Dimensions: Approx. 9.8 x 6.3 x 9.1 inches (250 x 160 x 230 mm); Tank Capacity: Approx. 9.4 x 5.3 inches (240 x 135 x 100 mm); Theoretical Tank Capacity: Approx. 10W :40kHz Heater: 100 W, Drain Included: No, Fan Included: No, Power Supply/Power Cord: AC 100 V-120 V, 60 Hz, Weight: Approx. 7.8 lbs (3.92 kg), Additional Features: Heater function (setting range: 1 - 99 minutes / 1 minute unit); Accessories: Cleaning basket x 1, lid x 2, cable x 1 instruction manual (English language not guaranteed). Book