Ketone meter specifically measures the amount of acetone excreted in breath, providing readings that relate well to blood ketone levels at low concentrations. Breath ketone meter has become the best alternative for keto diet followers to measure ketones, it’s low-cost and easy to use. Ketosis Readings Instructions (ppm): 0 ~ 1.9 PPM: You are not in ketosis or just right before ketosis. 2.0 ~ 3.9 PPM: You are at very early stage of ketosis. 4.0 ~ 9.9 PPM: You are in a light status of ketosis. The body fat is burning at a low pace. 10 ~ 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 leve 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: 1 x Ketone Meter 10 x Replaceable Mouthpieces 1 x Carrying String 1 x User Manual 2*AAA Batteries are not included