To ensure your CPAP is delivering the proper prescribed pressure, the Fisher & Paykel Water Manometer gives you an accurate reading each time. Manufactured by one of the leading manufacturers of CPAP machines and accessories, the Fisher and Paykel water manometer consists of a water column manometer and complete instructions. Easy to use, this device needs no calibration, is lightweight and travels well. This water manometer is compatible with all Fisher & Paykel CPAP humidification systems and measures 0-18 cm H2O. Allow yourself to get a night of safe, restorative sleep by following the exact pressure prescribed to you by your sleep specialist.