7, 8, 9, 10: Measurement functions:
11: Battery charge levels
12: Measurements log
13: Display of the first value
14: Display of the second value / Minimum
15: Display of the third value / Maximum
16: Display of the last measurement or of the calculation result
Measurement of area
Measurement of volume
Two-point Pythagorean
Three-point Pythagorean
21