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Scientific calculator by Casio. Widely used by students world-wide due to its great quality for the low price.

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Can't find the brightness changer mode

I have Casio 991-MS calculator and have an issue to change my display brightness,when I switching with Mode key,I can't find Cont mode,while in another same calculator there is , anybody can help me with that quickly?

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Here's an image taken from the Additional functions User guide 2 for the calculator, that may help.

It doesn't specify exactly what setup options are available if you press the Mode button >3 times but it says that it actually changes the calculator setup so perhaps the brightness function is in there. Worth a look perhaps.

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(click on image)

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