Gas Detector Sensor, Gas Detected Ammonia, Measurement Range 0 to 1000 ppm, 0 to 200 ppm, 0 to 250 ppm, High Range 0 to 500 ppm, Low Range 0 to 100 ppm (Standard), T90 Response Time 30 sec, 75 sec, Sensor Life 3 yr, Sub-Brand Manning, For Environment...