Sper Scientific 810026R Count Up/Count Down Timer with Memory 810026R Count Up / Count Down Timer with Memory - Magnetic, Clip or Stand Mount. Counts up or down for 100 hours in intervals of 1 second. In count down mode unique you how much time has elapsed after the alarm sounds. Count Up Channel: 1 / Count Down Channel: 1 Range: 100 Hrs | Resolution: 1 Sec Has a built-in stand, pocket clip, and magnet Dimension: 2-3/4 x 2-3/4 x 1/2"