Nascool Digital Peak Flow Meter Purchased on Amazon, brand new and unused. Unopened. It's digital, so it's easy to use. The instruction manual is in English. You should be able to understand it easily with Google Translate or similar. Purchased on Amazon for 8000 yen. Amazon Details: High Accuracy & High Repeatability - A differential pressure sensor is used, achieving high accuracy. No calibration is required after manufacturing. ATS ERS WRIGHT standards are provided. Automatically Displays PEF FEV1 - Measures forced expiratory volume in 1 second (FEV1) and peak expiratory flow (PEF). Portable Size and Easy to Use - Durable, compact, and portable. Easy to clean and disinfect. No disposable mouthpieces are required. Asthma Diary & APP - Helps track how well you are managing your asthma attacks. If you have symptoms or an asthma attack, record the triggers, symptoms, and what medication you used to relieve them. Professional IT team support. The "Sonmol PEF" app is available for free on Android/iOS for asthma management. Applicable to - Respiratory health, asthma patients, people with respiratory problems, COPD, smokers, athletes, and children aged 6 and over.