Mega electronics tri tank bubble etch unit mega electronics pa310 p this pcb etch tank 3 tank pa310 from mega electronics is a completely self contained three tank system for the production of printed circuit boards up to 320 x 260mm 12 6 x 10 2in p incorporating the following features tri tank unit 320 x 260mm working area with built in develop spray wash bubble etch functions providing a convenient bench standing system supplied complete with 2 syphons 2m of mains cable with iec