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ysi550a溶存酸素計、エラー表示

2017-06-28View Original

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手持ちのYSI 550Aポータブル溶存酸素計は、これまで常に汚水の測定に使用していました。今、電源を入れるとすぐにOUER(数字のマーク)というエラーメッセージが表示されます。どう対処すればよいかわからず、アドバイスをお願いします

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