DO9100 Dissolved oxygen meter 100% calibration in air; DO Meter calibrate

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How to use dissolved oxygen meter?
How to calibrate dissolved oxygen meter in air?
100% DO Meter calibration video
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Hi . I have got this meter can you get spare tips with the membrane in for these . I only have 1 left . Thanks.

jeff-y
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Hello, I have a newbie question about the electrolyte.
If I use the device daily for, say 15 days Ina row, should I remove and throw out the electrolyte everyday after using it, or can I leave the electrolyte in place? I'm afraid I'll have to use and buy a lot of electrolyte if I need to remove it after each measuring session

TheLaurentPetit
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My do9100 hanging always what happened

awanaquaculture
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Why is my meter reading drop to 0.0 reading all the time

rendyrosales