Counter-pen is a combination marker and digital counter designed for the lab and plant. Use it to count cell growth on petri dishes, inventory parts, and tally samples received. Counter beeps each time a mark is made ensuring an accurate tally. Lcd simultaneously displays total and can be reset at the touch of a button. Durable ABS plastic pen features on/off switch and comes with cap. Unit measures 6l x 2/3 dia (15.2 x 1.5 cm), weighs only 1 oz. Automatically beeps every time a touch is made easy-to-read LCD displays up to 99,999