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The 707 can make the following measurements:

O2 0 - 21%
CO2 (IR bench) 0 - 20%
CO2 (calculated value) 0 - 20%
CO low 0 - 300 ppm
CO/HCompensated 0 - 10,000 ppm
NO low 0 - 300 ppm
NO 0 - 5,000 ppm
NO2 0 - 1,000 ppm
NOx 0 - 5,000 ppm
SO2 0 - 5,000 ppm
H2S 0 - 500 ppm
CO high 0 - 2%
CO very high 0 - 10%
Combustion Air Temp. up to 100'C
Stack Gas Temp. up to 1,100'C *
Stack Draft Measurement +/- 100 hPa
Differential Pressure +/- 100 hPa
Differential Temp.

up to1,100'C *