Suaoki D40 User Manual page 8

Functions
Area,Volume,Indirect Measurement(Pythagoras)
Press button to change measurement functions.
Continuous Measurement
Area Measurement
Volume Measurement
Indirect Measurement
Addition/Subtraction
Take a measurement, then press
appear on display, then press
measurement, the second value will be automatically added to/subtracted
from the first one.
, addition/subtraction symbol will
button to take the second
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