Touch-Counterª is a combination marker and counter designed for the lab and plant. Each time an item is touched; it is automatically marked by the felt- tip pen and counted by the built-in digital counter. Use it to count sample bottles, cell growths, and to receive/inventory/ship supplies. Operation is simple: Touch an item and it is marked and counted simultaneously. Impossible to make an error, even when interrupted. Marks hold your place and counter holds your total. Durable aluminum unit has an audible click, zero reset knob, and a 9999-digit counter. Touch-Counterª is 7 x 2 x 1-1/2 inches in length and weight is 6 ounces. Spring-actuated ink reservoir valve seals felt tip when not in use and prevents ink dry-out. Supplied with black disposable pen.