Testo 300+ Flue Gas Analyser
The Testo 300+ Flue Gas Analyser is designed to make boiler servicing, commissioning and fault finding quicker and easier. Featuring a large 5-inch HD touchscreen, long-life sensors and Bluetooth connectivity, it delivers fast, accurate combustion analysis while simplifying everyday testing for heating engineers.
Compatible with the Testo Smart App, the analyser allows you to record measurements, create digital reports and share results directly from site. Its intuitive interface and guided measurement menus reduce setup time, while automatic calculations help improve efficiency on every job.
Choose the Right Kit
The Testo 300+ is available in four kit options, allowing you to select the equipment best suited to the work you carry out.
The Standard Kit includes everything needed for professional flue gas analysis, making it ideal for routine boiler servicing and combustion testing.
The Advanced Kit builds on this by adding pipe clamp temperature probes and a pressure testing kit, making it suitable for engineers who regularly carry out gas pressure testing and commissioning work.
The Smart Kit includes two wireless Testo 115i Clamp Thermometers and a Testo 510i Differential Pressure Meter. These Bluetooth instruments work directly with the analyser, providing wireless temperature and pressure measurements while reducing the number of cables required on site.
The Ultra-Smart Kit offers the most comprehensive package. Alongside all the equipment included in the Smart Kit, it also includes a gas leak detector, giving engineers everything they need for combustion analysis, pressure testing, temperature measurement and gas leak detection in one complete solution.
Designed for Everyday Servicing
The Testo 300+ combines a responsive HD touchscreen with robust construction to withstand daily use. The analyser features a long-life oxygen sensor with up to five years’ service life, an H₂-compensated carbon monoxide sensor capable of measuring up to 8,000 ppm and automatic pump protection during high CO measurements.
Bluetooth connectivity also allows compatible Testo Smart Probes to be connected wirelessly, while digital reports can be created and shared directly from the analyser or the Testo Smart App.
Why Buy from Test4Less?
At Test4Less, we supply genuine Testo products backed by expert technical advice and competitive pricing. Whether you choose the Standard, Advanced, Smart or Ultra-Smart Kit, you’ll receive a professional flue gas analyser designed to deliver reliable performance, accurate results and greater efficiency on every job.








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