Always know your O2 concentrations are safe by testing your Nitrox mix before you dive using this portable Nitrox Analyzer. With the included hose barb, you can test the nitrox mix with your low pressure inflator, while the tank is being used. The Analox Nitrox Analyzer is highly accurate, with an expected sensor life of 4 to 5 years. This item includes an oxygen compensation chart for use anywhere you travel to dive. This compensation chart allows for adjustments to correct the analyzer based on temperature and humidity.