Prokit's Industries NT-6570 - Manual (Page 5)

battery symbol until the next button is pressed.
Press this button and hold it to switch off the instrument..
The instrument switches off automatically after three minutes of
inactivity.
CLEAR button
The last action is canceled or the data display is cleared,
while making measurements. If in mode of History storage ,
press
to re-measurement
Reference level setting
fig.C
See Fig.C, The default reference setting is from the rear of the
instrument.
Press this button to take the selection from the front edge
，
A special beep sounds whenever the reference setting is
changed. After a re-startup the reference returns automatically to
the default setting (rear reference). See fig.C.
Press this button
again to take the next selection from end
piece edge.
Press this button, to set the rear reference again.
In a word, to select the reference level, push button 7 repeatedly
until the required reference level is indicated in the display. Each
time after switching on, the rear edge of the measuring tool is
preset as the reference level.
Display Back light
Click display backlight button to switch on or off, user can
trigger the function when he/she works in darkness situation. The
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