The Wellplate Chip has a 40x40 array of nano-litre wells. On the standard plate each well has a volume of 0.26nl, and customisation offers alternative volumes. The 40x40 array covers an area of 10x10mm and is designed to fit onto a microscope slide and under a standard cover slip. The wet etching process gives a surface roughness of < 5nm enabling optical access. Applications include: holding small droplets of reagents, groups of cells or reagent droplets and display technology.