Gas Detector Sensor, Gas Detected Carbon Monoxide, Measurement Range 0 to 1,000 ppm, Compatible Detector Model/Series Ventis MX4, Compatible Detector Grainger Part Number 5JNL7, Sensor Type Electrochemical, For Detector Type Portable, Compatible Detector Manufacturer Part Number MX4-K10311, MX4-K10321, MX4-K12311, VTS-K1231100101, VTS-K1231101101, VTS-K1232100101, VTS-K1232101101, VTS-K1232110101, VTS-K1232111101, VTS-K5232100101, VTS-K5232101101, VTS-K5232110101, VTS-K5232111101