3、The tool will have sound indication when pressing the key. It shows that the pressing key is effective.
4、Inaccurate measurement may result from the following:
a. When the battery runs out: at this time, the “
” icon will continuously appear on LCD to
remind you of replacing the battery.
b. When the measured distance is out of the effective range: the effective range is 2′~53′
(0.6~16m).
c. When the calculated result is out of the specified range: at this time, an error message “Err” will
be displayed on the lower line of the screen.
d. When addition of different parameters (e.g. length plus area), the “+” will be ignored and the
screen will keep the same read as the unit was operated before.
e. When another ultrasonic source or high frequency noise is nearby: leave or shut down the noise
resource when taking measurement.
f. When barriers appear between the tool and the measured surface.
g. When the measured surface is not smooth: the measured surface should be smooth, hard and of
homogeneity.
h. When the measuring environment is not good: the temperature and humidity will affect the
accuracy of measurement, and take measurement under environment of no wind, and temperature of
the unit should be same with temperature of the circumstance, especially for long distance measuring
(between 40′to 53′/ 12m to 16m), the relative humidity should be above 48%, and the size of
measured surface should be at least 10ft. by 10ft./3m by 3m.
i. When measuring, ultrasonic sensor aperture should straightly face to the measured surface.
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