PRESIDIUM Synthetic Diamond Screener II Bedienungsanleitung Seite 17

When the Low Battery Indicator turns red, the device is not able to
conduct any more tests and the UV light source inside the device will
not be able to switch on.
Replace the batteries or switch power source when it is necessary.
Battery Information
Do not leave worn out batteries in the battery compartment as the
batteries may corrode or leak, and damage the circuitry of the device.
It is recommended that batteries should be removed when the device
is expected to be stored for an extended period of time.
Batteries do not have to be removed from the unit when the Presidium
Power Universal Adaptor is used through the USB cable.
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