"DUAL CHANNEL; DIGITAL DISPLAY; 0-1 VOLT; CARBON MONOXIDE SCALE RANGE 0-3000 PPM WITH OPTICAL AND GAS FILTER; CARBON DIOXIDE SCALE RANGE 0-2 PERCENT WITH OPTICAL AND GAS FILTER; ABSOLUTE; IN-SERIES MEASUREMENT; INCLUDES TUBING,SWAGELOK CONNECTORS AND DIAPHRAGM PUMP"