WatchGas SST1 Serviceable NH3 Gas Detector SST1-A PORTABLE GAS MONITORS AND DETECTORS 4021-1 CO & O2 Manual:

4021-1 CO & O2 Manual:

hard to use refills

AC adapter (100 to 240 V

MotionAlert option tells others that user has become immobile

WatchGas SST1 Serviceable NH3 Gas Detector SST1-A PORTABLE GAS MONITORS AND DETECTORS 4021-1 CO & O2 Manual:Ammonia is pungent enough to smell at 5 ppm and by the time you can't smell it anymore, you're above OSHA's exposure limit. Anyone who works around ammonia refrigeration compressor rooms, poultry houses, fertilizer operations, industrial cleaning, chemical facilities knows the paradox: at low concentrations it's obvious, and at dangerous concentrations olfactory fatigue kicks in fast. Workers stop noticing what they're breathing. The WatchGas SST1 A