LEVL is pioneering a new frontier in fat loss – via a simple breath. By measuring acetone (a ketone body) in exhaled breath, the LEVL device provides you with the metabolic insights you need to make real time choices about your wellness plan. According to extensive clinical research, there’s a direct correlation between the amount of acetone in exhaled breath and the amount of body fat burned. Finally, a way to know you’re burning fat before you ever step on the scale.