GPI GPR-R220L, Instructions For Use Manual

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b) When the instrument is in this mode
，
there will be a signal on the LCD display to
alert user that the position of the instrument has changed.
8) The Detector
The detector will pick up a spinning beam when it crosses the electronic sensor
window. The detector has 3 buttons:
a) On/off button
b) A Sound button with 3 settings – of f- low - high.
c) A sensitivity button. This will either give a narrow or a broader range of detection.
When the detector is too high a slower beep be emitted, when too low
，
afast beep will
be emitted
，
when same level as beam a continuous pitch will sound-at this Point the
centre of the detector is at the same alignment as the beam.
To get accurate results use the spirit bubble to keep the detector level.
The detector is powered by a standard 3v battery.