Heli-Max HMXR4854 - Manual (Page 3)

OFF/ON Button: Press the button to turn the gauge on or off. The
gauge will turn itself off after 5 minutes of inactivity.
ABS Indicator: The gauge will be in ABS (Absolute Measurement
Mode) when it is turned on. This mode uses 0 degrees as the
reference point for all measurements. When the gauge is in this
mode, you will see a small pointer on the left side of the display
by the ABS sign.
REL Indicator: When the ZERO button is pressed, the gauge will
set the reference point to the angle that the gauge is in at that time.
The small pointer on the left side of the display will be down by
the REL sign. This indicates that the gauge is now in the Relative
Measurement Mode. Pressing the ZERO button again will put the
gauge back in the ABS mode.
HOLD Button: When the HOLD button is pressed, the gauge will
turn off the sensor and hold the reading that is on the display. A
pointer will be visible on the right side of the display by the HOLD
sign when this feature is active. Pressing the ZERO button again
will restore the gauge to normal operation.
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SETUP SETUP
Remove the battery compartment cover.
Peel off tape on the battery.
Replace the battery compartment cover.
The pitch gauge is now ready for use.