The Mini-Wright Peak Flow Meter by Clemente Clarke has been an industry leader for years. It provides an important early warning of bronchial dysfunction. Time and again the Mini-Wright has been rated superior by medical experts testing for accuracy and dependability. You can know with confidence that any change in daily readins reflects an actual change in your lung capacity, and not a change in the meter. Standard range is 60-900 lpm, and low range is 30-400 lpm. The Mini-Wright is 10" long and 2" wide. It comes complete with daily record charts.