Checkline MX-5 - Manual (Page 9)

MX-5 Ultrasonic Thickness Gauge
5
The UP arrow key has two functions. When the MX-5 is in calibration
mode, this key is used to increase numeric values on the display. An auto-
repeat function is built in, so that when the key is held down, numeric
values will increment at an increasing rate. When the MX-5 is not in
calibration mode, the UP arrow key switches the SCAN measurement
mode on and off. Refer to page 18 for an explanation of the SCAN
measurement mode.
The DOWN arrow key has two functions. When the MX-5 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 MX-5 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 M X-5 is
making a measurement and turn off after several seconds to conserve
battery life.