This listing is for JUST the PC board for the ART-MB3 30K as shown in the picture minus the quarter.
Part#: MB3001-042
This is a REPLACEMENT board intended for replace existing MB3 30K installations. The MB3 30K accepts 30K magnetostrictive ultrasonic inserts ONLY, any other frequencies will not work with the board.
Please save the green wire block from your existing installation, you will need it to install the new MB3 30K (shown in red circle in the next picture).
If you are unsure whether you need to 25K or 30K replacement, please contact us with the picture of the serial number of your existing Bonart built in scaler, and we will happy to verify for you.