325-3 Flue Gas Carbon Monoxide Analyzer CO, draft, pressure and differential temperature.
Quick and accurate CO testing in flue gases or ambient air Measure carbon monoxide levels, perform stack draft testing and pressure testing (positive, negative & differential) effortlessly with this easy-to-use, smartly designed analyzer. 
Large easy-to-see display with user-defined menu-driven logic. One-button draft measurement.
Built-in Differential temperature measurement. Infrared printer for on-site printing with date, 
time & analyzer serial number (optional). Magnetic-backed protection case with carrying strap (optional)

• Easy cell replacement,
  (no need for cal. gas in the field)

• Rugged, industrial probes for all applications

• Simple moisture removal with the integrated
  water trap

• User-serviceable, high capacity sampling
  pump

• Easy-to-replace particle/soot filter
  protects your investment

• Comes complete with zippered carrying pouch

• Splash-proof, grease proof, impact resistant TopSafe (optional)

Obtain a multitude of precise and useful readings, as this unit features an internal sampling pump, built-in trap and particle filter, built-in draft/pressure sensor, two K-type thermocouple jacks and a flue gas probe. For added versatility, it’s printer capable, if you desire a printout of results, including the date and time. 
Range:
0 - 2000 ppm CO; 
±16* H20 pressure 
Comes with CO Analyzer, flue gas probe & case 
Includes one 9V battery