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WatchGas SST1 Serviceable NH3 Gas Detector SST1 A 4 Gas Calibration Individual odor detection thresholds vary MEM01 N9680S Individual odor detection thresholds vary widely It is designed for use with non pumped (diffusion) monitors including the BW Clip OSHA's permissible exposure limit (PEL) for ammonia is 50 ppm as an 8 hour time weighted average and want to quantify what they're breathing
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