Summary
Testo 300+ Flue Gas Analyser Smart Kit
Accurate flue gas testing helps heating engineers make safe and clear service choices. The Testo 300+ Flue Gas Analyser Smart Kit measures oxygen, carbon monoxide and optional nitric oxide for detailed checks. It also supports temperature, draught and pressure work, so users can complete more tasks with one kit.
A 5-inch HD touchscreen makes the analyser simple to use during busy jobs. Clear menus help users move between readings, views and test data without delay. In addition, the CO sensor measures up to 8,000 ppm, giving a wider range for demanding heating checks.
Smart Testing and Data Sharing
Bluetooth connectivity allows up to four Testo Smart Probes to work at the same time. This helps engineers run parallel tests and reduce time on site. The Testo 300+ Flue Gas Analyser Smart Kit also uses WLAN to share reports quickly after measurements are complete.
Remote viewing through the Testo Smart App adds more control when access is limited. Users can monitor readings away from the analyser, which is useful in tight or awkward spaces. As a result, the second-screen feature supports safer and more flexible testing.
Reliable Kit for Heating Professionals
Long-life sensors support five years of dependable use and help reduce service needs. A scratch-resistant touchscreen adds durability when the instrument is used in tough work areas. Furthermore, the battery runs for up to 10 hours, helping users complete longer jobs with less downtime.
The Testo 300+ Flue Gas Analyser Smart Kit includes key accessories for common heating system checks. Pipe thermometers, a Bluetooth manometer, a Bluetooth Connector and a pressure connection set support a wide range of tests. With its strong sensor range and connected design, it gives engineers a practical solution for routine checks and more detailed fault finding.
Key Features
- Measures carbon monoxide up to 8,000 ppm
- Supports oxygen measurement from 0 to 21 vol
- Optional nitric oxide sensor range to 3,000 ppm
- Large 5-inch touchscreen for easy navigation
- HD screen gives a 1280 x 720 pixel display
- Connects with up to four Testo Smart Probes
- Bluetooth support helps run parallel tests
- WLAN data sharing supports faster reporting
- Second-screen viewing works with Testo Smart App
- Includes onboard combustion efficiency calculation
- Calculates flue gas loss from 0% to 99.9%
- Supports draught measurement from -9.99 to +40 mBar
- Pressure measurement covers -100 to +200 mBar
- Scratch-resistant screen helps protect daily use
- Long-life sensors reduce servicing needs
- Five-year warranty supports long-term ownership
Technical Specifications
| Product name | Testo 300+ Flue Gas Analyser Smart Kit |
| Manufacturer | Testo |
| Manufacturer part code | Not provided |
| Oxygen measurement range | 0 to 21% vol |
| Carbon monoxide measurement range | 0 to 8,000 ppm |
| Nitric oxide measurement range | 0 to 3,000 ppm with optional sensor |
| Draught measurement range | -9.99 to +40 mBar |
| Pressure measurement range | -100 to +200 mBar |
| Temperature measurement range | -40 °C to +1200 °C |
| CO2 calculation range | 0 to CO2 max |
| Combustion efficiency range | 0% to 120% |
| Flue gas loss range | 0% to 99.9% |
| Display | 5-inch HD touchscreen |
| Display resolution | 1280 x 720 pixels |
| Connectivity | Bluetooth and WLAN |
| Smart Probe support | Up to four Testo Smart Probes at the same time |
| Remote monitoring | Second-screen viewing with Testo Smart App |
| Report transfer | Instant data sharing through WLAN |
| Battery life | Up to 10 hours |
| Screen protection | Scratch-resistant touchscreen |
| Warranty | 5 years |
Comparison Table
| Data point | Testo 300+ Flue Gas Analyser Smart Kit |
| Main gas measurements | Oxygen, carbon monoxide and optional nitric oxide |
| CO range | 0 to 8,000 ppm |
| NO range | 0 to 3,000 ppm with optional sensor |
| Display format | 5-inch HD touchscreen with custom views |
| Wireless functions | Bluetooth, WLAN and Testo Smart App support |
| Included temperature tools | Two Testo 115i Bluetooth pipe thermometers |
| Included pressure tool | Testo 510i Bluetooth manometer |
| Included probe | Compact flue gas probe with 180 mm probe and 1.5 m hose |
| Carry solution | Soft case |
| Warranty | 5 years |
Document Downloads
What’s Included
- Testo 300+ Flue Gas Analyser with O2 and CO sensors
- Compact flue gas probe with 180 mm probe and 1.5 m hose
- Two Testo 115i Bluetooth pipe thermometers
- Testo 510i Bluetooth manometer
- Testo Bluetooth Connector
- Pressure connection set
- Soft case
Meta Description
Testo 300+ Flue Gas Analyser Smart Kit with 8,000 ppm CO range, 5-inch touchscreen, Bluetooth probes and WLAN reporting.




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