Important Tips to Get Accurate Ketones Readings! The monitor needs to be exhausted before your first use because each ketone breath analyzer was tested during the production before shipping to warehouse, it may have residuals; if you want to test another person consequently after your testing, please also kindly exhaust previous residuals. To do so, please repeat the warm-up procedure 1-2 times (without blowing) before you proceed to your first test. During testing, please blow immediately within first 5-6 seconds when displaying ""blo"" on the ketosis tester since the keto breath tester starts analyzing the breath right after the first 5-6 seconds. Using Steps: 1.Powered by 2x AA alkaline batteries (not included) 2.Press the power button for 3 seconds to start device 3.Warm-up and exhaust residuals 4.Blow for 5-6 seconds right after warm-up 5.Ketone meter analyzes and reading shows Breath Acetone Concentration Readings Instructions (PPM): 0 ~ 2 PPM: You are not in ketosis or just right before ketosis. 3 ~ 4 PPM: You are at very early stage of ketosis. 5 ~ 10 PPM: You are in a light status of ketosis. The body fat is burning at a low pace. 11 ~ 39 PPM: You are in the optimum level of ketosis. This is the stable fat burning zone, the process of fat being used by the body as the main source of energy. 40 ~ 59 PPM: Be Caution! You are approaching too much ketosis level. Adjust your level to under 40ppm. 60 ~ 99 PPM: Danger! You are in too high level of ketosis. Ketoacidosis. Ketone Breath Meter with 3 LED Indications: Green Light -- Ketosis Reading Successfully Amber Light -- Low Battery Red Light -- Ketosis Reading Unsuccessfully Contents of Package: 1x ketone breath analyzer device 10x mouthpieces 1x User's Manual