A series of horizontal bars of different lengths in the top right-hand corner of the display screen indicates
the state of charge of the rechargeable batteries. 3 bars indicate a fully charged battery; 2 bars three-
quarters charged; 1 bar half charged; no bars quarter charged or less – time to recharge.
When all the bars except the shortest have disappeared, it is time to recharge the batteries or replace
them with another battery pack. To recharge the batteries, simply plug in the battery charger lead to the
socket on the top end of the instrument and plug the charger into the mains. The batteries will be fully
charged in about three hours.
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IMPORTANT: Do not charge batteries or remove battery pack in potentially explosive atmosphere.
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The GFM400 Series uses rechargeable Nickel Metal Hydride cells. If you need to dispose of a set, please
take care to do so in line with local requirements. The expected life of the batteries is approximately 200 to
500 charge/discharge cycles.
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