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Hanwei Customized Professional Portable H2s / O2 Gas Detector Technology and Solution Supply. ATEX and IECEx approved. Ultra wide viewing-angle graphic LCD display. Audible, visual, and vibration alarming signals. Multiple alarms of Low-alarm, High-alarm, TWA, STEL, over-range, and battery low voltage alerts. Capable of parameter settings, log storage, export, and other functions (optional). Self-check function after power on (self diagnosis and repair).