What to do if I get 0% Anterior/Posterior LED and Focus during calibration?

This can happen if the calibration tool isn’t properly in place or the glass surface isn’t clear. To fix it:

1. Make sure the calibration tool is tightened securely and Ensure, the calibration tool is not loose.
2. Clean the glass part of the tool.
3. Place a clear thumbprint on the glass and try the calibration again. 

If the problem persists, please contact support@cassini-technologies.com for further assistance or visit support.cassini-technologies.com to raise an e-ticket.