Cole-Parmer Digital Counter Pen 20610-30 auspowers_batchthree you can also connect a

you can also connect a separate 3-pin (TRS) external microphone and powered speakers

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Cole-Parmer Digital Counter Pen 20610-30 auspowers_batchthree you can also connect aCole Parmer Digital Counter Pen 20610 30 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 6''l x 2