From The Collaborative International Dictionary of English v.0.48 [gcide]:
Colony counter \Col"o*ny count'er\ (k[o^]l"[-o]*n[y^] kount"[~e]r), noun (Microbiology) an instrument designed to conveniently count or assist counting colonies 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 on the plate, the completion of the electrical circuit causes an increment of 1 unit on the readout of the colony counter. [PJC]
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