Testo 320 Combustion Analyzer with Printer

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  • Regular price $1,699.00


Testo 320 Combustion Analyzer with Printer

The new Testo 320 Commercial Combustion Analyzer is built around a high definition color display, giving users more of the data faster. With the flue gas matrix you can monitor a user defined parameter (CO for example) over time, graphically seeing how adjustments have affected overall performance. The bright display can show from two to eight parameters at one time, without scrolling down, so you can get the whole picture without taking your hands off your work.

The Testo 320 measures CO and O2, and calculates CO2, combustion efficiency, excess air, and CO air free. The 320 features field-replaceable long life sensors expected to last up to 3 years, and the instrument itself will monitor the sensors. The Testo 320 also measures draft and pressure, temperature in the room and the flue, and ambient carbon monoxide. The Testo 320 can store and recall up to 500 readings and customer data.

One great feature of the Testo 320 is the ability to connect optional probes. Use the Differential Temperature Set for better analysis of supply and return flows. Or connect the Ambient CO probe to measure room and flue CO simultaneously. The Gas Leak probe can locate and record levels of a combustible gas leak. Even check indoor air quality (IAQ) with the optional Ambient CO2 probe.

The Testo 320 also offers the option to be equipped with Bluetooth capabilities to allow wireless connection to a PC, printer, or Android device. TestoDroid is the free Testo Android app which allows data measurements to be live streamed and stored to any android device. TestoDroid also has the ability to start and stop measurements. It gives you the option of viewing the data in a chart, like the one on the Testo, or to produce a graph. The app also provides the option of saving the data not only onto the device, but also saving data on google drive or putting it directly into an email.


  • O2, CO (w/ NOx filters standard), CO2
  • Draft & Pressure
  • Temperature (flue & ambient)
  • Combustion efficiency & excess air
  • Undiluted CO (CO air free)
  • Ambient CO
  • Long life sensors
  • Rugged housing
  • Full color graphic display
  • Flue Gas Matrix (with four user-defined combustion types)
  • Oil flow and gas clock BTU calculator
  • Memory to 500 readings plus customer site information
  • Optional probes available
  • Quick exchange probe filter
  • Integrated condensate trap
  • IR wireless printer
  • Optional Blutetooth Connectivity to other devices

Warranty Information

The Testo 320 Combustion Analyzer carries a 2-year warranty, 1 year on battery.

Product Specs
Parameter Range Accuracy
O2 measurement 0 to 21 vol% ±0.2 vol%
CO measurement 0 to 4000 ppm ±20 ppm (0 to 400 ppm)
±5% of m.v. (401 to 2000 ppm)
±10% of m.v. (2001 to 4000 ppm)
Temperature -40 to 2192 °F ±2 °F (32 to 212 °F)
±0.5% of m.v. remaining range
Draft measurement -4 to 16 inH2O ±0.008 inH2O or
±5% of m.v. (at -0.2 to +0.2 inH2O)
±0.01 inH2O (at 0.2 to 1.2 inH2O)
±1.5% of m.v. (at 1.2 to 16 inH2O)
Pressure measurement 0 to 120 inH2O ±0.2 inH2O (0.0 to 20 inH2O)
±1% of m.v. (at 20 to 40 inH2O)
±1.5% of m.v. (at 40 to 120 inH2O)
Efficiency testing 0 - 100% calculated
Excess Air 0 - 99% calculated
CO2 0 to CO2 max calculated
Ambient CO measurement
(with CO probe)
0 - 500 ppm ±5 ppm (0 to 100 ppm)
±5% of m.v. (>100 ppm)
Combustible Gas measurement
(with gas leak detector probe)
0 to 10,000 ppm CH4 / C3H8 Signal Optical display (LED)
Ambient CO2 measurement
(with ambient CO2 probe)
0 to 1 vol. % 0 to 10,000 ppm ±50 ppm or ±2% of m.v. (0 to 5000 ppm)
±100 ppm or ±3% of m.v.(5001 to 10000 ppm)
Storage temp. -4 to 122 °F
Operating temp. 23 to 113 °F
Power supply Rechargeable battery: 3.7 V/2400 mAh Power supply: 6 V/1.2 A
Memory 500 readings
Display Color graphic display 240 x 320 pixels
Weight Approx. 1.3 lb
Dimensions 9.5 x 3.3 x 2.5 in.
Warranty Instrument/probes/gas sensors: 24 mos. Rechargeable battery: 12 mos.
  • Testo 320 Combustion Analyzer
  • Rechargeable battery
  • 12 inch probe with cone & hose assembly
  • AC power supply (with USB recharging)
  • Rugged case
  • IR wireless printer
  • Printer paper (10 rolls)

Free Shipping


Our policy lasts 30 days. If 30 days have gone by since you received purchase, unfortunately we can’t offer you a refund or exchange.

To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.