The Rossmax PF120C is a lightweight and portable, high quality peak flow meter designed specifically for children. It measures the peak expiratory flow rate (PEFR) which is how quickly you exhale. If you have a low rate, it can indicate problems like asthma, or worsening lung disease. By having a peak flow meter, it can be used to monitor your PEFRs which is very important when managing these problems. Product Features: -Compact, lightweight and portable -Built-in flexible three –zone management system -Easy- to- read numbers -Measurement Range 50-400 L/min -Accuracy and repeatability assurance -Suitable for use with disposable mouthpiece -Design for child -Washable Product Specifications: - 02 Years Warranty - Measurement Range: 50 - 400 Ltrs/min - Designed For: Child - Certifications: EN ISO Compliance; CE Approval