SpiroAir Lt, the dry rolling seal spirometer made by Medisoft is the gold standard for volume determination. The rigidly engineered spirometer with an accurate bore and stroke maintained with a linear seal offers the most accurate respiratory measurements, unaffected by the viscosity and composition temperature of the gas to be measured. This characteristic makes it suitable for a wide range of applications; Pharmaceutical trials Quality control assurance Outpatients Spirometry Epidemiology Studies Research Routine Lung Function The advantage of « True » Spirometry by this method is it is unaffected by the content of the gas to be measured, requiring no computerised correction to values and « absolute » scale. The materials used ensure excellent temperature stability under all conditions.