Bacharach 6600-8220 – MGS-550 Replacement Sensor, EC, NH3, 0-1,000 ppm (N/A in Ex d)

1000 ppm CO2 Calibration kit – 1,000 ppm CO2 gas, 0 ppm gas (Air). Item is HAZMAT for shipping purposes, available only in continental USA, and non-cancelable / non-returnable