How to get accurate ketone readingsThe monitor needs to be exhausted before your first use since it may have residuals from production to warehouse if you want to test another person consequently after your testing, please also kindly exhaust your previous residuals. To do this, turn on the Keto Breath Meter, wait for the 15 seconds countdown finish, and turn off. Repeat the same procedure 1-2 times (without blowing) before you proceed to your first test. During testing, please blow for 5 seconds immediately once START showing then ketone meter will start analyzing your breath, the readings will be visible 10 seconds. Cautions Before Measurement: Please test your ketone levels under the same conditions each time right after waking up in the morning before consuming anything in fasting status! 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 xAAA Batteries are not included