detectable sensitivi type 1 ppm, reaction chamber 110 degrees c, operating temperature extremes in degrees centigrade 5 to 40, precision porm 1 percent, output 0 to 10 mv and 0 to 1v, power requirements 105-125v, 50/60 hz, 350 w, dimensions in inches 16 wide by 8.5 high by 17 deep