Make sure that your fingers are not cold. This app is for recreational and fitness use only! --------------------- MAIN FEATURES: √ Heart rate measurement √ Heart Rate Activity Zone Calculator √ Pulse waveform graphs √ Unlimited data storage and tags √ Export data for registered users √ Sharing to Twitter and Facebook Note: DISCLAIMER - Heart Rate monitor is for reference purposes only. Consult your doctor if required. - Since this application uses flash, in some devices may cause hot LED flash. - heart rate detection not intended to be used as a medical device. - This Heart Rate Measurement app not intended for heart disease or condition diagnosis (afib, heart murmur) - It does not detect blood pressure or bloodpressure.