How to choose ultrasonic cleaner Frequency ?

The Ultrasonic cleaner frequency for cleaning application in daily life is : 28KHz, 40KHz(42-48KHz), 80KHz. Different frequency regularly with different feature and is suitable for different purpose and different items cleaning application. The ultrasonic cleaner frequency is smaller, the ultrasonic cleaner viration power is stronger. So it is not the smaller frequency is better. To choose frequency for your items cleaning, depands on what products you clean. For regular items cleaning, 40KHz is universal frequency, and most items choose this frequency. And some mini or fragile items, can choose 42KHz-48Khz for cleaning ; For 28KHz , some hardware or auto parts or big machine parts will choose this frequency .