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Old 12-01-2010, 06:33 PM   #1
Steven9026
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I just bought a bottle of PH test strips and want to test my mash PH. How long do you wait after you add your grains to the tun before you test the PH?

Thanks,

Steve



 
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Old 12-01-2010, 06:50 PM   #2
hamiltont
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I usually wait ~15 minutes. I've also read (Kaiser) that they read .3 lower than the actual PH.. I don't have any way to verify that statement but trust Kai. Quote "the strips read about 0.3 pH units lower than the pH that was determined with a pH meter. " Here's a link:

An_Overview_of_pH


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Old 12-01-2010, 07:54 PM   #3
Steven9026
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Thanks, I have seen that posted before too.. I just didn't know the time frame..

 
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Old 12-01-2010, 08:13 PM   #4
remilard
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Quote:
Originally Posted by hamiltont View Post
I usually wait ~15 minutes. I've also read (Kaiser) that they read .3 lower than the actual PH.. I don't have any way to verify that statement but trust Kai. Quote "the strips read about 0.3 pH units lower than the pH that was determined with a pH meter. " Here's a link:

An_Overview_of_pH
That is the colorphast brand strips in a particular range, not strips in general.

 
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Old 12-01-2010, 08:14 PM   #5
the_bird
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Quote:
Originally Posted by hamiltont View Post
I usually wait ~15 minutes. I've also read (Kaiser) that they read .3 lower than the actual PH.. I don't have any way to verify that statement but trust Kai. Quote "the strips read about 0.3 pH units lower than the pH that was determined with a pH meter. " Here's a link:

An_Overview_of_pH
Kai's show me this with my ColorPhast strips and his pH meter. Strips were reading that I was around 5.2 - 5.4 (in the proper range), but I was really at 5.7.
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Old 12-01-2010, 08:35 PM   #6
wildwest450
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Ph strips are junk imo. I have hundreds you can have for free, simply either don't work or are wildly inaccurate.

 
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Old 12-01-2010, 08:37 PM   #7
SpanishCastleAle
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FWIW, when I was getting low on my first bottle of pH strips I bought another. Then I compared the old strips with the new strips...not even close to the same readings.
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Old 12-01-2010, 08:41 PM   #8
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Quote:
Originally Posted by wildwest450 View Post
Ph strips are junk imo. I have hundreds you can have for free, simply either don't work or are wildly inaccurate.
See, that's why I bought the "good" ones (which you can get for about half their HBS cost, if you buy them from a lab-supply store). Should have spent the money on a damn pH meter!
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Old 12-01-2010, 11:38 PM   #9
ajdelange
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I think the bottom line is that anything that reads in increments of 0.3 pH isn't of much use in brewing. I used to hesitate to say that because pH meters were so expensive but they aren't any more.

 
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Old 12-02-2010, 07:28 PM   #10
Steven9026
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I now know what you mean by the PH strips being junk. The ones that I bought are made by Precision Labs, and after trying them on several water sources and different liquids that had different PH levels, they read the same on all of them.. LOL... I guess it's time to buy a good PH meter maybe..



 
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