Starting at $1,510.00
Starting at $1,359.00

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  • Draft and pressure measurement
  • Ambient CO measurement
  • RESNET certified combustion analyzer
  • Differential temperature
  • High-definition graphic display
  • Sensor diagnostics & monitoring
  • Ultra-rugged housing
  • 30 second start up
  • Hands-free operation
  • Easy to see and replace filters
  • Store up to 500 tests
  • Hardened cam-lock fittings
  • Simple icon navigation
  • Quick drain condensate trap

The Testo 320 Combustion Analyzer makes combustion analysis easier to perform, easier to control, and easier to understand. The 320 is designed for the job site and for the contractor that expects more. Use it for basic testing and tuning of all types of boilers, heater or furnaces. Use it to set up and commission more complex multi-stage, or modulating heating systems. Combustion analysis, draft, temperature, pressure, combustion efficiency and a host of other calculations and functions - all shown in vivid color. With simple icon navigation, you soon realize it will do more for HVAC testing. The 320 is a RESNET certified combustion analyzer.

With the testo 320 you gain more testing flexibility giving you more customer opportunities and greater profit potential. It provides all the parameters listed, plus the capabilities shows in the following pages.

The testo 320 gives you a wider measurement range that lets you test not only controlled or normal combustion applications but those that have problems. With a CO measurement range up to 4000 ppm (or optional 8000 ppm) you can test more combustion appliances.

The testo 320 eliminates the guess work and provides accurate readings. Integrated NOx filters assure you of the highest CO measurement accuracy, unlike other analyzers that add the NOx concentration to the CO measurement displayed. Whether you are measuring combustion, air free, or ambient CO – you need to make the decision on a correct measurement.


Testo Compact Probes
7" or 12" Compact Probes, 1/4" diameter w/ 5' hose 932°F
Testo Modular Probes
7" or 12" Modular probe, 5/16" dia, w/ 7' hose, t max=932°F
Testo 330 Gas Leak Detection Probe
Gas leak detection probe for Testo 330 combustion analyzer
Testo Dual Wall Probe
Curved, dual wall probe for annular gap O2 supply


Testo Infrared Printer
Testo printer with wireless IRDA and infrared interface
Testo Thermal Printer Paper
Thermal paper for Testo Infrared printer
In Stock


Testo EasyHeat Software CD
Set up, download, and analyze data with unique data streaming mode (interface cable not included)


Please consider these optional accessories.

Testo Particle Filter 10 Pack
Particle filters - pack of 10
Testo Smoke Pump Test Kit
Standard Smoke Pump Test Kit (includes scale, filter paper and lubricant)
Testo Manual Smoke Pump Filter Paper
Manual smoke pump filter paper - 40 strips
Testo Smoke Pump Scale
Smoke pump scale
Testo Hose Extension
9' hose extension for Testo 320 / 330 combustion analyzers
Testo 0393 0005 Replacement O2 Sensor
Testo 0393 0053 Replacement CO Sensor
Replacement CO Sensor, 0 to 4000 ppm