Labtron Manual Colony Counter offers rapid, accurate manual colony counting with a multi-mode feature and 3 ~ 9 times of magnification power. Compatible with 50–90 mm petri dishes and operates in temperatures between 5-50°C with a counting  range of 0 to 999. It includes a beeping noise to prevent errors, a counting pen to ensure no cells are missed, and adjustable bright white lighting for easy colony visibility.