Use APKPure App
Get ASUS Heart Rate old version APK for Android
Contact technology measures your heart rate without any additional device.
With the latest contact measurement technology, you can now record and keep track of your heart rate under various situations use embedded flashlight without any additional device.
Non-contact measurement app can be download from below link:
https://play.google.com/store/apps/details?id=com.asus.asusheartbeat
BTW, It doesn't work if your device doesn't have flashlight.