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Provides a cost effective and accurate way to count colonies of bacteria or other microorganisms grown on an agar plate. This easy to operate, hand held device marks, counts and gives an audible and visual alert each time a count is recorded. The lightweight, pen style design reduces the likelihood of error, combining all aspects of counting into one motion. CE approved. Fast, accurate and economical sample counting and verification of sample count for up to 35 plates Ability to count both up and down to verify sample count Can display the total sum of all colonies counted Backlit display allows easy viewing in low light conditions Audible alert can be turned off if desired Counting function can be locked to prevent errors during breaks between counting Long life, red and black felt tip markers (included) work on plastic or glass and are oil and water resistant; ink is removable with ethyl alcohol. Includes 3V lithium battery and protective storage case