These peak flow meters meet or exceed ATS standards for accuracy and precision. They offer an integrated three-zone asthma management system that helps patients comply with treatment regimens. The color-coded indicators can be adjusted to delineate a patient´s green, yellow and red zones based on a personal best peak flow. Available in full (60 to 810L/min. in 10L/min. increments) and low (50 to 390L/min. in 5L/min. increments) ranges, both with companion card.