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The Instrumentation Industries, Inc. Negative Inspiratory Force (NIF) Meters are devices used to measure and monitor patient inspiratory effort. During use the NIF Meter is attached to the patient airway at a point that provides optimal readings of patient respiratory effort. Federal law restricts these devices to sale by or on the order of a physician.

The NS Series NIF Meters are intended to measure inspiratory airway pressures of up to 30, 60 or 120 cm H2O , dependent upon the specific model used.

The Mercury Medical Negative Inspiratory Force (NIF) Disposable Manometer is used to indicate inspiratory force.

The Mercury Medical® Negative Inspiratory Force (NIF) Disposable Manometer is designed to connect to an endotracheal tube. To record the maximum inspiratory pressure, the occlusion knob is held down during patient inhalation. The knob is released immediately after measurement. A memory pointer identifies and remains at the maximum inspiratory pressure to -60cm H2O. Rotating the memory pointer knob counterclockwise resets the memory pointer.