Can I use any breathing tube on the market for testing, as long as it fits into the sensor?

As a crucial component of the TrueFlow technology, the measurement accuracy is also ensured by the ndd Spirettes/EasyOne FlowTubes, which are precision-manufactured and undergo stringent quality inspections. Therefore we highly recommend using the original ndd Spirette/EasyOne FlowTube to fully benefit from the TrueFlow technology.