Colony counter
Colony counter Col"o*ny count`er (k[o^]l"[-o]*n[y^] kount"[~e]r), n. (Microbiology) an instrument designed to conveniently count or assist counting colonies[9] of microorganisms on a plate containing a gelled growth medium. One variety uses a pencil-like rod with a metal tip, which is connected by an electrical connection to the gelled growth medium; when touched to a colony[9] on the plate, the completion of the electrical circuit causes an increment of 1 unit on the readout of the colony counter. [PJC]

The Collaborative International Dictionary of English. 2000.

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