Fitted with automatic 3 Digits LED Digital Display. Counting plate with illuminated standard wolf hugel ruling ensures clearly differentiated and sharply defined colonies. Each touch of making pencil in the petri dish increment the colony count by '1' and the glowing LED Display depicts the total colony count. Provided with a manual reset of digital display, ON/OFF Switch, counting plate, 100 mm. dia lens, cord and plug. To work on 220V A.C.