2 Tank ultrasonic cleaning equipment

Two tanks separate washing from what comes after it — either a rinse, or drying, depending on which one your parts actually need.
The wash-plus-dry configuration puts filtered ultrasonic cleaning in tank one and hot-air drying in tank two, so parts leave the line dry and ready for assembly, coating or packing. The wash-plus-rinse configuration adds a dedicated rinse stage instead, which is what parts need when no detergent film may remain on the surface — before plating, before painting, before bonding.
Which of the two you need is decided by the next operation, not by the part. If something is going to be applied to that surface afterwards, rinse. If the part goes straight to assembly or storage, drying usually matters more. Where both are required, a three-tank line handles it in one pass.