With the arrows, you can navigate to needed icon (program)
With center button, you select to enter.
2. Button to enter measurement mode.
3. Button to start the calibration.
4. Button to stop measurement sequence for the current sample.
5. Average calculation
Appears only after third measurement. With this button, you can stop the sequence and ask for a calculation with the measured average. Mainly used when the device don't start to calculate after 12 measurements.
6. Group selection
Selecting this icon, allows you to navigate in group selection screen.