... and the cleaning effect is good, is the most ideal, the most affordable cleaning equipment. Ultrasonic wave ... a few additives as a cleaner, the cost is low and the cleaning effect is good, is the most ideal, the most affordable cleaning ... ; · the advanced third generation generator, the efficiency is better, the frequency is higher, the quality is better; · 40KHz, 68KHz, 80KHz, 120KHz, 170KHz, ...