Special beakers with an adjustable black rubber support ring are available on request. They are used to save detergent liquid whenever small quantities of objects are to be cleaned, or if washing is to be performed with a detergent solution in a beaker and rinsing simultaneously in another beaker. They are also used to wash objects with particularly aggressive solutions which must not come into direct contact with the steel tank. This kind of cleaning is also called "indirect cleaning" because the solution (generally aggressive for the tank) does not fill the ultrasonic tank.
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