AsthmaCheck® Peak Flow Meter, 10/CSPRODUCT FEATURES: Its built in, three zone system facilitates patient training and compliance and allows for flexibility in setting the zones to meet patients' individual needs Measuring only 2 Inches by 6 Inches, the meter meets ATS standards for accuracy and precision Meter is equipped with an easy grip handle to direct hands away from the airflow path and features a linear scale Designed for single patient use, the device can be cleaned with soap