An Automatic Colony Counter is a laboratory instrument designed to detect and count microbial colonies growing on culture plates. It replaces much of the repetitive work involved in manual colony counting, helping laboratories achieve faster and more consistent results. The system typically uses a camera or imaging sensor to capture a detailed image of the culture plate.

Specialized software then analyzes the image, identifies visible colonies, and calculates their number according to selected counting parameters. Depending on the model, users can adjust settings to improve detection for different media, colony sizes, or plate conditions. Results may be displayed digitally, stored electronically, and used for reporting or documentation. Automatic colony counters are commonly used in pharmaceutical, food, environmental, clinical, and research laboratories. By combining imaging with automated analysis, these instruments can reduce manual counting errors, save valuable technician time, and support efficient, reproducible microbial testing workflows.