Dakota Ultrasonics PX-7 - Manual (Page 9)

PX-7 Ultrasonic Thickness Gauge
5
The SCAN key switches the SCAN measurement mode on and off.
Refer to page 17 for an explanation of the SCAN measurement mode.
The DOWN arrow key has three functions. When the PX-7 is in the
CAL mode, this key is used to decrease numeric values on the display. An
auto-repeat function is built in, so that when the key is held down, numeric
values will decrement at an increasing rate. When the PX-7 is not in
calibration mode, the DOWN arrow key switches the display backlight
between three available settings. OFF will be displayed when the backlight
is switched off. AUTO will be displayed when the backlight is set to
automatic mode, and ON will be displayed when the backlight is set to stay
on. In the AUTO setting, the backlight will illuminate while the PX-7 is
making a measurement and turn off after several seconds to conserve
battery life. Finally, if the DOWN arrow key is pressed and held down while
powering the PX-7 on, a LOC mode will be toggled on/off.