Scienceware* Handheld Electronic Colony Counter

In a single motion, this colony counter marks, counts and confirms with a beep. The lightweight 42.5 g (1.2 oz) pen-style colony counter features a four-digit LED display that shows cumulative count. A selector switch allows for counting up or down to correct errors or to check the count by counting backwards. Powered by a 3V battery. Felt-tip marker works on plastic or glass and is oil and water-resistant; marks are removable with ethyl alcohol. Comes with red and black markers. Dimensions: 6 x 3/4 x 3/4 in. (152.4 x 19 x 19 mm). CE marked.