The disposable ndd Spirette mouthpiece acts as a hygienic shield, and is transparent to the ultrasonic pulses travelling between the measurement transducers. It contains an ultrasonic sensor to monitor the air going in and out of the patient’s lungs. Features:• Positioning of teeth keeps spiretteTM securely in place • Tight lip seal prevents leaks • Bacteria filter membrane built into each spiretteTM prevents cross contamination • Mouthpiece is made of smooth non-stick polyethylene for patients comfort, shaped oval for optimal lip seal and teeth positioning, and conical to suit different mouth sizes • no other running costs are involved: no costs for calibration equipment, no costs or downtime for maintenance, no costs for filters, sensors, or adaptors, spiretteTM is the only accessory • Just insert spiretteTM , ready for measurement (no bar code, no input of numbers) • The TrueFlow instrument guides you through the process of spirometry • No maintenance whatsoever is needed with spiretteTM and TrueFlow instruments • No calibration or checking procedures are required • The safest respiratory fl ow measurement system available • Lightweight PE, environmentally friendly, disposable and bio-degradable