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Commonly used for Asthma patients, the In-Check Oral Inspiratory Flow Meter is a portable hand-held inspiratory flow meter that provides an assessment of the speed of inhalation. The In-Check Oral measures inspiratory flow between 30 and 370 L/min, inspiratory flow is thought of by physicians as a sensitive marker for Chronic Obstructive Pulmonary Disease (COPD) screening. The In-Check Oral works when a patient inhales through the mouth, this will cause air to be drawn through the meter and a cursor moves along the scale to indicate the speed of inhalation. The flow rate achieved can be noted by checking the position of the cursor against the calibrated scale. The Standard In-Check Oral inspiratory flow meter can measure inspiratory flow rates in the range 30 to 370 l/min, with an accuracy of +/- 10% or 10 l/min (whichever is the greater). (A Low Range In-Check Oral Inspiratory flow meter is available by special request, measuring between 15 and 120 l/min).

All In-Check Oral meters are calibrated using an ATS pulmonary waveform generator, and the product complies with the Australian and New Zealand standards for back pressure in flow meters. As with any inhalation device checking for loose foreign objects is important. The transparent body of the In-Check Oral meter is designed to allow a visual inspection before use. The meter is manufactured from medical grade components, and is suitable for multiple patient use when cleaned appropriately between patients. The expected life of the In-Check Oral, in normal use, is two years.