This is the simplest, least error-prone counter I could design. It's meant to be perfect for tracking daily quotas like Weight Watcher points or glasses of water per day. Error Proofing features: 1)Clicks and color changes tell you that your counter is working. 2)Reset button only works after being held for at least 1 second. 3)Pressing screen and holding for at least 1 second will undo the last count.