DigiVac Bullseye Precision Gauge Piezo User Manual - Page 10
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In any display mode, the UP and DOWN buttons turn the backlight on and off (respectively),
the SEL button enters the configuration menu, and the PWR/EXIT button turns the gauge on
or off.
The battery indicator shown at full strength
In practice, this indicator changes based on the current level of pressure.
The numeric display shows when the vacuum sensor is disconnected, failed or when an over-
range condition exists (pressure above 775 Torr).