Midmark’s Soniclean Ultrasonic Cleaners, like the M250 and the M550, use a high frequency transducer that allows the units to perform quietly. Tiny cavitation bubbles are produced with the higher frequency, allowing the bubbles to penetrate smaller crevices. This results in a powerfully quiet ultrasonic cleaner. Soniclean Ultrasonic Cleaners are extremely easy to operate, simply load your instruments and set the timer.