SCOR Keeper tracks the increase in Carbon Monoxide, an odorless, colorless toxic gas, and provides an early warning that levels are rising, before they become life threatening. The long term health impact of low exposure to carbon monoxide levels is significant: 0-9 ppm CO: no health risk; normal CO levels in air.10-29 ppm CO: problems over long-term exposure; chronic problems such as headaches, nausea30-35 ppm CO: flu-like symptoms begin to develop, especially among the young and the elderly.36-99 ppm CO: flu-like symptoms among all; nausea, headaches, fatigue or drowsiness, vomiting.100+ ppm CO: severe symptoms; confusion, intense headaches; ultimately brain damage, coma, and/or death, especially at levels 300-400+ ppm .