Need RO water for pH pen calibration - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 06-25-2012, 02:11 PM Thread Starter
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Need RO water for pH pen calibration

Does anyone know where I can get some RO water around Chelsea, Manhattan? I just need a cup to calibrate my pH pen. Thanks
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post #2 of 4 (permalink) Old 06-25-2012, 02:37 PM
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all the pH pens I've owned needed calibration fluid, either 7.01 or 4.01, to calibrate. Never heard of needing/using RO for this. maybe for a TDS pen...

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post #3 of 4 (permalink) Old 06-25-2012, 03:15 PM
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you could use distilled water purchased at the grocery store >or< same thing


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post #4 of 4 (permalink) Old 06-25-2012, 05:54 PM Thread Starter
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Quote:
Originally Posted by rrastro View Post
all the pH pens I've owned needed calibration fluid, either 7.01 or 4.01, to calibrate. Never heard of needing/using RO for this. maybe for a TDS pen...
there were 2 packets that came with the package and I think they're in powder form. So I think they need to be mixed in with water.
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