A device, formed as a round, shallow-sided dish, produced with given dimensions, into which a culture is placed and kept whilst being incubated, treated and analysed. Commonly known as a Petri dish, this device will fit into a range of laboratory instrument...
A line-powered diagnostic ophthalmic instrument, typically hand-held, used in ophthalmic work for examining the corneal topography. The device consists of a specially designed round plate, with a concentric bore and concentric white and black rings (Placido...