In measurements on heating system burners, obstructed measurement apertures can occur (e.g. due to sloping roofs, cramped basement rooms). In these cases, the usual straight flue gas probes can only be inserted into the flue with great difficulty. With flexible flue gas probes made of metal, there is a danger that the probe shaft is over-bent, and can break. Our flexible probe shaft offers the ideal solution to this problem: It is made of very flexible plastic, and can thus be bent easily without breaking. This allows you to carry out flue gas measurements without any problems, at any measurement site. The flexible probe shaft can be used at temperatures up to 180 °C, and for short periods even up to 200 °C. The probe shaft can attached to your already existing modular flue gas probe from Testo. If you do not have a modular flue gas probe available to you, we recommend purchasing our flexible flue gas probe (0600 9770), which is supplied as the flue gas probe together with the flexible probe shaft. Flexible probe shaft for attachment to modular flue gas probes. Our flexible probe shaft helps you to carry out flue gas measurements even on difficult-to-access measurement apertures. Since the probe shaft is made of very flexible plastic, you can easily bend it, allowing it to be inserted into exhaust flues which are obstructed (e.g. by sloping ceilings).