distiled water quality

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Hi there. How long is distiled water gut for testing specific gravity using refractometer after you open the bottle. I by water from Dis chem 1liter. How do I know for how long is showing me correct reading
 
Hi there. How long is distiled water gut for testing specific gravity using refractometer after you open the bottle. I by water from Dis chem 1liter. How do I know for how long is showing me correct reading
I don't think the water will get contaminated because you openned the bottle but I'm not sure. Refractormeter is usually configured using RO water.
 
thank you very much you are second person today teling mi this , never hear this before.Just show you you are never to old to learn something new.
 
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