testo 300 - Flue gas analyzer (O2, CO up to 4,000 ppm)

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The testo 300 flue gas analyzer is ideal for the most important measurements involving heating systems. It combines decades of experience in measuring technology with contemporary smart-touch operation, robust construction and e-mailing of reports. The testo 300 enables easy measurement of flue gas, draught, pressure, ambient CO and differential temperature.

  • Intuitive measurement menus and the fast-response Smart-Touch display ensure easy operation – as on your smartphone

  • Including O2 and CO sensor up to 4,000 ppm

  • Large 5-inch HD display – see all the system's measuring values at a glance

  • Creation of documentation directly on site and e-mailing of reports


Product Description

Truly smart flue gas measurement on heating systems with the testo 300 flue gas analyzer. High-quality sensors, intuitive operation with smart-touch technology and smart features, such as efficient documentation and e-mailing of reports, will make your day-to-day work easier.

testo 300 flue gas analyzer with smart-touch operation – Features

Impressive measuring technology and quality

  • O2 sensor and CO sensor up to 4,000 ppm
  • Longer sensor service life thanks to automatic sensor protection
  • TÜV-tested according to first German Federal Immission Control Ordinance (BImSchV) and EN 50379, Parts 1-3
  • Integrated fine pressure
  • Versatile probes and fast probe changes: take advantage of quick-change probes and the multi-functional handle for attaching a variety of probe shafts (each available to order separately). You can for instance use longer probe shafts for flue gas pipes with larger diameters or flexible probes for difficult-to-access measuring points
  • Optionally available probes and accessories for further measuring tasks, such as gas flow pressure measurement, gas pipe testing, differential temperature measurement and ambient CO measurement

Smart, intuitive, efficient: easy operation in day-to-day work

  • Smart-touch display for intuitive operation of the flue gas analyzer: the display responds without delay – just as easy as on your smartphone
  • Get the measurement result faster: clearly structured measurement menus for all relevant measurements
  • Create documentation (including measuring value, measuring location, customer data) easily on site
  • Save PDF measurement reports directly in the instrument and always have them available
  • Signature function: your customer can sign measurement reports directly on the instrument
  • E-mail measurement reports directly to the office or to customers via WLAN (hotspot)
  • Large 5-inch HD display – enables you to see all the system's parameters immediately
  • Testo interface function for direct data transfer of measuring values to industry/customer-specific software*
  • Ready to use straight away: in standby mode, the testo 300 is ready to measure at the touch of a button. Use it straight away with the next customer – because you no longer need to wait for the end of the zeroing phase
  • Integrated Bluetooth® interface: immediate printout of the measuring values on site with the appropriate printer


*Note: the manufacturer has to integrate an interface into the industry software to use the function


Other advantages

  • 10-hour rechargeable battery life: an average measurement period of 2 hours means the flue gas analyzer is capable of being used for one week
  • Integrated, extra-strong magnets for easy fixing during the measuring process

Delivery Scope

testo 300 flue gas analyzer with O2 and CO sensor up to 4,000 ppm, USB mains unit

Temperature - TC Type K (NiCr-Ni)
Measuring range  -40 to +1200 °C
Accuracy ±0.5 °C (0.0 to +100.0 °C)
±0.5 % of mv (Remaining Range)
Resolution 0.1 °C (-40 to +999.9 °C)
1 °C (Remaining Range)


Differential Pressure - Piezoresistive
Measuring range  -100 to +200 hPa
Accuracy ±0.5 hPa (0 to +50.0 hPa)
±1 % of mv (+50.1 to +100.0 hPa)
±1.5 % of mv (+100.1 to +200 hPa)
Resolution 0.01 hPa


Flue gas O?
Measuring range 0 to 21 Vol.%
Accuracy ±0.2 Vol.%
Resolution 0.1 Vol.%


Differential Pressure flue gas Draught - Piezoresistive
Measuring range  -9.99 to +40 hPa
Accuracy ±0.005 hPa (+0 to +0.1 hPa)
±0.02 hPa (+0.1 to +3.00 hPa)
±1.5 % of mv (3.01 to +40 hPa)
Resolution 0.001 hPa (0 to 0.1 hPa)
0.01 hPa (Remaining Range)


Flue gas degree of effectivity, Eta (calculated)
Measuring range  
0 to 120 %
Accuracy 0.10%


Flue gas loss (calculated)
Measuring range 0 to 99.9 %
Accuracy 0.10%


Flue gas CO? calculation (calculated from O?)
Measuring range Display range 0 to CO? max
Accuracy ±0.2 Vol.%
Resolution 0.1 Vol.%


Flue gas CO (without H?-compensation)
Measuring range 0 to 4000 ppm
Accuracy ±20 ppm (0 to 400 ppm)
±5 % of mv (401 to 2000 ppm)
±10 % of mv (2001 to 4000 ppm)
Resolution 1 ppm


Ambient CO
Measuring range 0 to 2000 ppm
Accuracy ±10 ppm (0 to 100 ppm)
±10 % of mv (101 to 2000 ppm)
Resolution 1 ppm


General Technical Data
Weight                                                 approximately 800 g
244 (including probe connection) x 98 x 59 mm (LxWxH)
Operating temperature  
-5 to +45 °C
Operating humidity
15 to 90 %RH non-condensing
Protection class IP40
Product colour black/orange
Display type 5.0" touch display, HD 1280*720 pixels, IPS (160 k)
Power supply Rechargeable battery, USB mains unit
Authorizations TÜV-tested according to 1st German Federal Immission Control Ordinance (BImSchV) EN 50379, Parts 1-3
Guarantee Gas sensors (O?, CO) 24 months; rechargeable battery: 12 months; Thermocouple 12 months
Warranty conditions  
10,000 measurement values
Storage battery type Lithium ion battery

Battery life
10 h
Storage temperature  -20 to +50 °C


Differential Pressure 4 Pa measurement - Piezoresistive
Measuring range  -50 to +50 Pa
Accuracy ±0.3 Pa (< 10 Pa)
±3 % of mv (Remaining Range)
Resolution 0.1 Pa

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Product Brochures

Data sheet testo 300


Short manual testo 300