Description
Testo 300 – Commercial Combustion Analyzer with Long Life Sensors (0564 3004 92)

Intuitive and easy to use
- Touch sensitive color screen
- Large, 5″ high definition display
- Enables creation of documents while onsite
- Ready to measure at the touch of a button
The Testo 300 LL COMM (catalog number 0564 3004 92) is a commercial combustion analyzer with O2 and CO sensors. CO measurement is up to 4,000 ppm. This model features long life sensors and a sensor warranty of four years. This version of the Testo 300 contains a slot for a third sensor. It does not include a printer or NO sensor.
In the smart world of today, a combustion analyzer needs to do much more than provide reliably accurate results. Key to technician efficiency is an instrument that performs before and after taking a measurement to ensure speed and accuracy through an intuitive interface designed to make work easier.
The user-friendly and highly efficient testo 300 was developed with this objective in mind. It is not just decades of experience in measuring technology. With smart-touch operation, robust construction and e-mailing of reports, the testo 300 will quickly become your indispensable companion for all measuring tasks involving heating.
![]() | Operation via smart-touch E-mailing of reports Keep an eye on all the measuring values Get the result faster Ready to use right away Completely worry-free |
Extended warranty includes instrument, sensors, & flue gas probe
Register at www.testo.com
Truly robust:
The construction.
| Smart measuring technology is of little benefit if it can’t keep going in tough day-to-day working conditions, because your measuring instrument is a partner that supports you every day in the efficient, problem-free performance of your tasks. This is precisely why the testo 300 has a particularly resilient and high-quality construction. | Protected display Scratch-resistant, recessed and with a special replaceable protective film.
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![]() | Secure mounting 4 strong magnets with rubber coating – particularly material friendly
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Bolted housing For that extra degree of stability when it really matters.
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Robust sensors Optional: extremely durable O2 sensor and automatic dilution up to 30,000 ppm CO.
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Truly flexible:
Instrument configuration and probe system.
| The testo 300 doesn’t just give you smart operation – the configuration also has that certain something. This means you can choose between a 2-year and 4-year warranty for the sensor technology. In addition to O2 and CO, you can also add a third sensor slot for the measurement of NOx as an option. Various kits with special instrument configurations and individual accessories are available, specifically tailored to the requirements of your individual application. | ![]() |
Versatile probes – quickly changed
| One handle for a variety of probes A variety of probe shafts can easily be attached to the multi-functional handle. This ensures you enjoy a high level of flexibility in all applications. And you are ready to measure even more quickly, thanks to connection via a universal plug. | Proven probes You can use the testo 320, testo 330 and testo 330-1/-2 LL probes with their practical multiple plug for the testo 300 as well. | New probes New probes with anti-rotation USB C connection are available for temperature measurement, for example of flow and return temperatures, along with ambient CO measurement. |
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Testo 300 Model Comparisons
Testo offers several variations of its 300 series combustion analyzer. The 300 is available with NOx sensors, specialized long life sensors, a printer, as well as higher range CO detection. The following is an overview of each. For detailed information on part numbers and features, please see the Q&A section of this page.
| testo 300 | testo 300 Longlife | testo 300 Longlife (30,000 ppm CO) | |
| Fuels | Oil, gas, solid fuels | Oil, gas, solid fuels | Oil, gas, solid fuels |
| Sensor slots | O2, CO | O2, CO, NO – can be retrofitted | O2, CO H2-compensated, NO – can be retrofitted |
| Measuring ranges | CO: 0 to 4,000 ppm | CO: 0 to 4,000 ppm | CO H2-compensated: 0 to 30,000 ppm (by fresh air dilution) |
| Longlife sensors with up to 6 years’ service life | – | ✔ | ✔ |
| Flue gas loss measurement | ✔ | ✔ | ✔ |
| Draft measurement | ✔ | ✔ | ✔ |
| Differential / gas flow pressure measurement | ✔ | ✔ | ✔ |
| Error and sensor diagnosis | ✔ | ✔ | ✔ |
| Zeroing with probe in flue gas | – | – | ✔ |
| PDF reports | ✔ | ✔ | ✔ |
| Signature function | ✔ | ✔ | ✔ |
| Warranty (instrument, probe, O2 and CO sensors) | 2 years | 4 years (NO sensor 2 years) | 4 years (NO sensor 2 years) |
| Warranty with product registration | 3 years | 5 years | 5 years |
| Display | 5″ HD touch display (1280 x 720 pixels) | 5″ HD touch display (1280 x 720 pixels) | 5″ HD touch display (1280 x 720 pixels) |
| Memory | 1,000,000 readings | 1,000,000 readings | 1,000,000 readings |
| PC software | testo EasyHeat software | testo EasyHeat software | testo EasyHeat software |
| Instrument operation | via smart-touch display | via smart-touch display | via smart-touch display |
Combustion Analyzer Template | |
|---|---|
| Includes NO sensor | No |
| Includes NO2 sensor | No |
| Includes printer | No |
| Includes SO2 sensor | No |
| Digital device | Yes |
Product General Attributes | |
| Product Height | 14.30 IN |
| Product Length | 18.70 IN |
| Product Width | 5.10 IN |
| HTS/Schedule B Number | 90271010000 |
| ECCN Number | EAR99 |
| Country of Origin | Germany |
| Shipping Height | 14.30 IN |
| Shipping Length | 18.70 IN |
| Shipping Width | 5.10 IN |




















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