Probably the best known peak flow meter, the familiar red and grey colour of Clement Clarke's meter is recognised by many people around the world. Mini-Wright peak flow meters are available in both Standard and Low Range - making them suitable for Adults and Children alike. All Clement Clarke peak flow meters are assessed for accuracy individually, before being packed. The Mini-Wright Standard and AFS Low Range are both calibrated by hand, to ensure that readings from any two meters are comparable. This enables a patient to use a Mini-Wright at home, and use a different Mini-Wright at the Clinic, yet still rely on the readings obtained. Mini-Wright peak flow meters also have a built-in one-way valve - an individual is prevented from inhaling through the device. This reduces the risk from others who have previously used the meter. It also facilitates the use of inexpensive cardboard tubes as disposable mouthpieces. Mini-Wrights are constructed from medical grade materials - they can be cleaned easily by agitation in mild detergent, rinsing, and allowing to dry completely. The normal life for a peak flow meter is three years - after that time, they may need replacing. Suitable for most older children and adults 60-800 Litres per minute measuring range Supplied complete with instructions for use, patient self-monitoring chart and sterilisable universal mouthpiece