Fitted with automatic 4 digits LED Digital Display. Counting plate with illuminated standard wolfhugel ruling ensures clarity differentiated and sharply defined colonies. Each touch of marking pencil in the digitis increments the colony count by '1' and the glowing LED Display depicts the total colony count. Maximum colony count possible upto 9999 Provided with a manual reset of digital display, ON/OFF Switch, counting plate, 100 m.m. dia lens, cord and plug. To work on 220 V.A.C.