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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.