A pen is a tool used for writing or drawing with a colored fluid, such as ink. A ballpoint pen is a pen that uses a small rotating ball made of brass, steel or tungsten carbide to disperse ink as you write.
ALPHA CHEM- 315 Spare Colony Counter Pen
Description:-
A combination marker and digital counter designed for the laboratory and plant. Each time a black mark is made with the felt-tipped pen, it automatically sounds a beep, and LCD displays the counts. Use it to count cell growth on petri dishes, inventory parts, and tally samples received. Touch, sound, and count occur simultaneously. Impossible to make an error, even when interrupted—marks hold your place and counter holds your total. Durable ABS plastic unit provides audio/visual counts to 99999 with reset button, on/off switch, and pen cap. Size is 6 x 2/3 inches and weight is 1 ounce.
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