This simple writing accessory is designed to keep a marking pen in a convenient place, ready to use, when only one hand is free. Ideal for use near an autoclave, incubator, centrifuge, storeroom, freezer or anywhere on the lab bench. Sharpie® markers or other similar pens will fit. The holder can be attached to any flat surface, such as lab equipment, a wall, a fume hood or even the benchtop with its adhesive backed, press-fit Dual Lock™ reclosable fastener. The pen used must have a cap with a pocket clip for attachment to the penholder well. Molded of tough, black polycarbonate, the holder is 25 x 25 x 51mm H (1 x 1 x 2" H).