With just one RR interval, conventional heart rate belts already have a fluctuation range of around 20 milliseconds. Added to the entire recorded ECG, this results in considerable measurement inaccuracy when using pulse belts. Based on this insight, we developed our own sensor so that we can provide our users with the most accurate measurements and evaluations. The Vitalmonitor Nano samples at a frequency of 300 Hz. In addition, our software detects occasional extrasystoles and does not include them in the calculation.