The testo 300 flue gas analyzer with Longlife sensors is ideal for heating engineers who carry out installation and maintenance work on heating systems several times a day. 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 – you can also retrofit an NO sensor.

The testo 300LL Longlife Standard Kit is a professional flue gas analyser package with long-life O₂ and CO H₂-compensated sensors up to 30,000 ppm, with NO measurement available as a retrofit option. It provides reliable combustion data for engineers carrying out demanding heating service work. It is ideal for boiler servicing and commissioning, combustion efficiency checks, CO safety testing and emissions reporting.

The testo 340 flue gas analyser is a high-performance emissions monitoring tool designed for industrial applications. Equipped with an O₂ sensor, an integrated flow and pressure difference measurement feature, and a calibration protocol, it delivers precise and adaptable flue gas analysis. The ability to add up to four gas sensors makes it suitable for a variety of industrial environments, ensuring reliable performance in high gas concentration conditions.

Cross sensitivity to NO and SO<sub>2</sub> is blocked by the CO sensor replacement filter during flue gas analysis.

General technical data	Weight 6 g
	Dimensions height: 12.9 mm, ø: 29 mm
	Product colour white

CO replacement filter for sensor

CO replacement filter for sensor

General technical data

General technical data