PCB etching tank heating

Well you can use plastic clips, a common aquarium air pump and an aquarium bubble wand. No special recommendation since there are bunch of quality pumps out there. I made my own PCB processing tanks with acrylic glass. There are 3 processing tanks, etching compartment, washing compartment and developing/stripping compartment. The heaters are controlled with the microprocessor temperature controller. I stole the idea from Mega Electronics UK, PA310 Tri-Tank Unit -> Mega-UK - PCB Processing Tanks Will soon post some of my pics soon.