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The MicroDirect MS03 MicroPlus Spirometer is ergonomically designed. For healthcare facilities that need an inexpensive spirometer, with proven accuracy, this one is versatile. The simple to read liquid crystal display shows Measured Force Expired Volume in one second. This spirometer is lightweight, at only 8 ounces, with a flow rate range of 0.2 to 15 liters/second. The volume range is from .1 to 9.99 liters. This MicroDirect product uses a single 9 volt battery. A centralized switch enables the user to turn it on with either hand. In the world of spirometers, this one was built to last.