What could be used to test the function of an ultrasonic unit?

An effective method to test the function of an ultrasonic unit is by utilizing aluminum foil. This material can help evaluate the unit's cleaning efficiency, as it can create a visible indication of cavitation activity. When aluminum foil is placed in the tank of an ultrasonic cleaner, the foil should exhibit signs of pitting or erosion after being subjected to the ultrasonic waves. This demonstrates that the cleaning action is functioning properly, as it is the result of the cavitation bubbles created by the ultrasonic waves impacting the foil's surface.

While materials like sterilization strips can serve a purpose in other contexts, they do not specifically measure the function of the ultrasonic unit itself. Red dye #6 would not provide relevant information regarding the cavitation process, and an oscilloscope is more suited for assessing electrical signals rather than the operational efficacy of an ultrasonic cleaning mechanism. Therefore, aluminum foil is the appropriate choice for testing how well an ultrasonic unit is cleaning, as it provides a clear and direct indication of the unit's performance through observable changes in the foil.