we are offering carbon dioxide transmitter.model - esense ( 050-8-005)(wall mtspace mt, with disp) measurement range 0 to 2000 ppm power supply - 24 v acdcout1 linear output - 0 to 10 v dc (co2)out2 linear output - 2 to 10 v dc or 4 - 20 ma (co2)operation temperature - 0 to 50cdimensions (h x w x d) - 100 x 80 x 28 mmaccuracy - 30 ppm 3 % of reading