11
LIGHT
In the dark, press to illumi-
nate the display for about five
seconds. Note that the back-
light may not be visible in
daylight or normal room
lighting.
CLR/TEST
In the Rate Mode, press and
hold to enable the Display
Test Sequence (page 17).
The Battery Life Indicators
The UltraRadiac has two battery life indica-
tors. See “The Batteries” on page 41 for in-
structions on changing the batteries.
•
If a blinking is displayed, the unit has
stopped functioning. Replace the batter-
ies before the unit’s next use.
•
If a blinking BAT is seen in the top-left
corner of the display, the unit’s batter-
ies have 10 hours or less of useful life.
Replace the batteries as soon as possi-
ble.
•
If the display is blank, the batteries are
dead. Replace the batteries before the
unit’s next use.
