40khz is the most popular ultrasonic cleaner found in the industry today, if you plan to buy ultrasonic cleaners, the 40Khz ultrasonic cleaner will be a good choice for you. About volume, we could offer 3.2L,4.5L,6L.8L,7L,11L,15L,20L, 22L, 30L,this frequency of ultrasonic cleaners has a good combination of power, penetration, and can successfully address most cleaning applications when combined with a properly-engineered cleaning system. The 40Khz ultrasonic cleaner can be used to clean many kinds of items, especially medium weight. The 40Khz ultrasonic cleaner operates more quietly, produces gentle cleansing action and has little damage. Our 40Khz ultrasonic cleaner is perfect, whether in performance or in the material itself. We also dealt with its details. If you want to find out more about our 40Khz ultrasonic cleaner, you can contact us.