Colony Counter

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A Colony Counter, as the name suggests, is an instrument used to count colonies of bacteria or other microorganisms growing on an agar plate, which is a petri dish that contains a growth medium used to culture microorganisms. Colony counter is a more sophisticated and modern device to detect bacteria colonies electronically.

Earlier, the device made to detect colonies of bacteria was simply a lighted surface on which the agar plate was placed. The identified colonies would be marked off with a felt-tipped pen on the outer surface of the plate and the operator would manage the counts manually. However, colony counters count the colonies electronically by identifying individual dark and light spots as per the automatic or user-set thresholds, and ultimately counting the resulting contrasting areas. Colony counters is a handy device in clinical research, microbiology, hygiene and quality control.