Each time a black mark is made with the felt-tipped pen, it automatically sounds a beep, and LCD displays the counts.
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. Replacement pen cartridge Cat. No. 3135. Replacement battery Cat. No. 1104