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A single gas unit with 24 month life. Small and easy to use:
FEATURES: " No calibration required " 24 month continuous operation prevents user tampering with measurement. " Out of the box solution with one button operation " Impact & weather resistant " Rugged impact & weather resistant housing Gases CARBON MONOXIDE (CO) Level 1 35ppm; Level 2 100ppm HYDROGEN SULFIDE (H2S) Level 1 10ppm; Level 2 15ppm OXYGEN (O2) Level 1 23,5%; Level 2 19,5%
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