Normally memory on the device is not infinite, So it almost can take up to 100 records.
But before that, you should Sync with any device like a Mobile phone or PC,
Clear history of record after using it many times and after you sync as mentioned before,
Follow these steps if you don't know how to clear the history of records on the App :
To delete recordings inside the SonoHealth app press and swipe a recording to the LEFT.
A DELETE button will appear on the right. Click the button to remove that EKG from the app
Follow these steps if you don't know how to clear the history of records on the device(EKGraph) :
To clear EKG history stored on the EKGraph device open the SonoHealth app and navigate to Menu > Settings > Clear Memory
Before pressing the Clear button your EKGraph must be powered on and nearby.
NOTE: EKGraph must be turned on and nearby.
WARNING: This action is irreversible. Once you click the clear button ALL the data on the device will be gone.
Stay Safe and Healthy!