Smart Digital Three-Frequency Series

The three-frequency series puts 40, 80 and 120 kHz into one benchtop tank; according to the product page, the frequencies can be selected individually or stepped through automatically in sequence. Sizes run from 6 L (JPS-30SP) to 30 L (JPS-100SP) with adjustable ultrasonic power, a 1–99 min digital timer, a 20–80 °C thermostat, a stainless steel tank and shell, a drain ball valve from 6 L and cooling fans from 10 L. Which frequency your surface tolerates is a question for a trial on your own parts, and the free cleaning test is the place to start.