The Analytical Industries Palm Oxygen Diving Analyzer is portable, accurate and affordable; our customers tell us this unit is extremely easy to use. One button calibration in either Air or 100% Oxygen is exceptionally easy and the Palm 'D' will analyze diving gases for oxygen content between 0% and 100%, with a resolution of 0.1% and response time of less than 6 seconds for recreational nitrox mixtures. The user-replaceable thermally compensated sensor maintains accuracy levels that exceed dive industry standards. Just hold the Palm 'D' directly to the cylinder valve outlet and crack open the valve slightly until the reading is stable; works with both Yoke and DIN valves with only one hand and no adapter needed! An optional 2 liter-per-minute flow sampling adapter for the standard BC inflator hose quick-release fitting is also available. The durable impact resistant housing is sealed for excellent water resistance, includes an on/off switch and allows for user-replacement of the two 1.5V AA alkaline batteries with an approximate life of 13,000 hours of continuous use. Ergonomically designed to comfortably fit your hand, the Palm 'D' offers a very compact form factor of { 2.7 in | 6.9 cm } wide by { 4.1 in | 10.4 cm } tall by { 1.4 in | 3.6 cm} deep and {7 oz | 196 g} weight. With a user-replaceable oxygen sensor and typical sensor life of 36 months, the AII Palm 'D' Oxygen Analyzer is an excellent value solution for your long-term needs.