Garrett Metal Detector GTI 1500 Owner's Manual page 34

lower the pitch to a bass tone. All touches
will make changes indicated on the Upper
Scale. Experiment to find the pitch that
suits your hearing.
Battery Gauge
The scale (lower right of screen) indicates
the condition of standard (carbon or alka-
line) or rechargeable batteries. To turn on
the rechargeable option, press the MENU
touch pad until RECHARGE is displayed.
Press the (+) or (-) touch pad to activate.
 - Garrett Metal Detectors