Our application is free to download and use, along with the advertisement is a way to make everyone appreciate this application at NO-COST. Thanks on your comprehension! Go ahead and take new monitor with you and have the health practitioner or nurse check it for accuracy by evaluating the readings https://modernsmarthealth.com/product/top-value-buy/health-monitor/blood-pressure-monitor/health-care-automatic-digital-wrist-cuff-blood-pressure-monitor-heart-beat-rate-arm-pulse-meter-machine-tonometer-for-measuring/