A cost effective and accurate way to count colonies of bacteria or other microorganisms grown on an agar plate.Fast, accurate, economical counting; marks, counts, and gives audible and visual alertsLightweight, pen-style design stores up to 35 sample counts with up/down verificationBacklit display for low light conditions; audible alert can be turned offCounting function can be locked to prevent error during breaksIncludes long life felt-tip markers, 3V lithium battery, and protective storage case