A friend of mine just came back from DEMA and said that he was told that the proper method was to keep the sensor in a humid environment Tim, moisture will cause the sensor to read high and erraticly. Oxygen is the "fuel" for these sensors, so just keep it from it's fuel and it will last longer. Otherwise , it is always working. They will eventually also short out internally if exposed to humidity,and will the read zero all of the time. I have used these devices for several years, and find that just keping the sensor separate in a small container or plastic bag, away form temperature extremes is the best bet for longevity, but with constant use, they only last a little more than a year. - G
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