Mild steel construction powder coated, suitable magnifying lens along with counting plate, writing pen, glare free lighting system counting plate illuminated standard wolfhugel ruling ensures clearly differentiated and sharply defined colonies. Each touch of marking pencil in the petri dish increments the colony count by '1' and the flowing led digital depicts the total colony count. Maximum colony count possible upto 9999 (4 digital display). Provided with a manual reset of digital display. Electric supply work on 220230 volts, 5060 Hz AC