crwdns2934241:0crwdne2934241:0 Htoo Tint Tint Kyi

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in dark place cannot see display

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991es plus i bought 13years ago, now i use it to change the battery but lighting strong place there can use it. no lighting dark place cannot see the display but its working. how should i do?

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Casio FX-991ES Plus

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open