Gas Detector Sensor, Gas Detected Hydrogen Sulfide, Measurement Range 0 to 500 ppm, Compatible Detector Model/Series Ventis MX4, Compatible Detector Grainger Part Number 5JNL6, Sensor Type Electrochemical, For Detector Type Portable, Compatible Detector Manufacturer Part Number MX4-K02311, MX4-K02321, VTS-K1231100101, VTS-K1231101101, VTS-K1232100101, VTS-K1232101101, VTS-K1232110101, VTS-K1232111101, Sensor Life 2 yr, Series Ventis MX4