NIX Spectro 2 Quick Start Manual page 11

Using the Reference Tile
You will periodically be required to confirm that the Nix Spectro 2 is within
advertised specifications. The app may request access to your camera to
scan the QR code accompanying the reference tile (used for the verification
process), accept the request.
To verify your Nix Spectro 2, Press the icon located on the right top
corner and select Calibrate to start the process. Remember to remove
any adapters you may have attached to the Nix Spectro 2. Follow the
instructions on the app, which will confirm whether or not the device is
calibrated to the factory settings.
See page 13 for instructions on cleaning the reference tile.
Remember: Always close the reference tile container and store in the
included carrying case to prevent dirt or dust buildup which can impact
future measurements.
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NIX SPECTRO 2: QUICK START GUIDE