DETECTOR OTHER TYPE; TYPE: CARBON MONOXIDE MEASUREMENT; MINOR SCALE: 0 PPM; MAJOR SCALE: 1500 PPM; ALTAIR 2X SENSOR XCELL CO STEEL (HYDROGE N (H2) RESISTANT); MEASURING RANGE FROM 0 TO 1500 PPM; OPTICAL, ACOUSTIC AND VIBRATING ALARMS SET AT 25 PPM FOR THE 1ST ALARM AND 125 PPM FOR THE 2ND ALARM; CALIBRATION: MUST COME WITH ITS CERTIFICATE AND CALIBRATION WAFER AFFIXED TO THE EQUIPMENT. MANUFACTURER 1: MSA; N-PART 1: 10154074; MODEL 1: ALTAIR 2X