Test kits to measure ph below 6? - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 09-27-2014, 05:48 PM Thread Starter
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Test kits to measure ph below 6?

Sorry if this is a newbie question but are there good test kits to measure ph levels below 6 or do you need a ph meter?
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post #2 of 5 (permalink) Old 09-28-2014, 01:18 AM
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Smile pH Meters Are Easier But Chemicals Are More Fun

Hi

Methyl red, called C.I. Acid Red 2 (2-(N,N-Dimethyl-4-aminophenyl)azobenzenecarboxylic acid), very red at pH 4.4 (and below), remarkably orange at pH 5.1 and bright yellow at pH 6.2.

Look in microbiology sales places for C.I. Acid Red 2, it is principally used to identify fecal contamination. Handy stuff to have about the house. In IMViC test Methyl red is the “M” part of the test.

I am sure places like Carolina Biological carry it (I really like Carolina Biological, an unpaid, unsolicited endorsement). Sorry for the delay, just checked and my Methyl red is definitely Carolina Biological.

As it happens I use Bromocresol Green - Methyl Red, Aqueous, for Alkalinity when measuring carbonate hardness.

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Joe
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post #3 of 5 (permalink) Old 09-28-2014, 06:03 AM
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Some pH tests do include methyl red in the reagent. Otherwise, use a pH pen which can be pretty cheap to buy.
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post #4 of 5 (permalink) Old 09-30-2014, 12:41 AM
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Hi,

A friend just told me about Nutrafin pH test, apparently goes from pH 4.5 to pH 9.0. I haven’t used it but I am told it seems to work well.

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Joe
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post #5 of 5 (permalink) Old 09-30-2014, 11:27 AM
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