How to get accurate ketone readings? 1. In order to get accurate ketone readings, please exhaust the residuals completely with the ketone meter before your first use by running the keto breath tester 3 times without blowing,because each ketone breath analyzer was tested during the production before shipping to warehouse, there maybe residuals if you want to test another person consequently after your testing, please also kindly exhaust your previous residuals. 2. Please blow immediately within first 5 seconds when displaying BLOW on the ketosis tester if you finish the residuals exhaustion step, because the ketone breath tester starts analyzing the breath right after the first 5 seconds How To Test Your Ketone? 1.Hold the power button for 3 seconds until the device turns on 2.Wait 20 seconds countdown for device warming-up, exhausting the residuals 3.Blow with the mouthpiece for 5-6 seconds, the testing result will be analyzed and displayed on the screen Kind Reminder: Readings will be slightly different from the blood meter because of different analyzing methods. Please catch the same keto meter to track your own personal ketosis records, only in this way you can get your own changing status. Package Contains: 1x portable ketone meter 10x replaceable mouthpieces 1x carrying string 1x user manual 2 AA Batteries are not included? Monitor your acetone level and weight:Following weekly and days results. It will help you plan your nutrition and fitness regime. no replacement strips or additional supplies to purchase. ? The highly sensitive acetone sensor is protected with self-diagnostics for sustainable and long term use. The device automatically detects whether a self-diagnostic test is required. ? Breath ketone meter detects your breath acetone from 0 to 99 PPM and follow 6 level guidance: 0.0-1.9ppm (No ketosis), 2.0-3.9ppm (Early Stage Ketosis), 4.0-9.9ppm (Light Ketosis), 10-39ppm (Stable Fat Burning Zone), 40-59ppm (Caution-High Ketosis), 60-99ppm (Ketoacidosis). ? Accurately measures breath acetone concentration at 100 resolutions (0.0 99) using a PPM (Part Per Million) measurement. Ketone Breath Meter provides you of results that are simple and easy to understand. ? 3 seconds is enough time to hack your metabolism. Take a breath slightly then breathe out into the device. It displays a result after blowing for just 3 seconds. An installed highly sensitive flow-rate sensor ensures accurate results.