Your RuuviTag can be absolutely connected and recovered to another device. Sign in to your Ruuvi Station app on the second device and if you have claimed your sensor ownership, your RuuviTag sensor card will appear back to the app. To do this, make sure that your sensor ownership is marked to your account.
To claim ownership of your Ruuvi sensor in Ruuvi Station mobile app:
Go to Sensor Settings by choosing Sensor Settings & Alerts in three dots menu (dashboard) or tap on the cogwheel icon on Sensor Card (full image view).
On the Sensor Settings page, see Owner under General.
If the field shows No Owner, the sensor has not been claimed and it can now be claimed to the account you have signed into Ruuvi Station with.
If the field has an email address, the sensor ownership has already been claimed. The email address is partially hidden with * to show the current owner if this is not the email address associated with the account that you used to sign in to the Ruuvi Station app.
Tap on the Owner field to access the Claim Sensor page.
Tap Claim Ownership button to assign ownership of the sensor to the account with which you are signed into Ruuvi Station.
You will be forwarded back to the Sensor Settings page and your email address will appear under Owner.
Your RuuviTag sensor also records history to its internal memory with 5 minutes interval for maximum of 10 days and this history can be recovered to Ruuvi Station app on history page when you tap the Sync button when you are in the vicinity of your sensor.