Failed colour chart - JBL ph 3-10 Test kit - The Planted Tank Forum
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post #1 of 8 (permalink) Old 07-21-2012, 03:02 PM Thread Starter
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Exclamation Failed colour chart - JBL ph 3-10 Test kit

i've been using JBL Combi Test for a month and everything works fine except the PH test that i couldn't figure out whether my tank has Ph 7.5 or 8. so i went to my LFS and asked them to test the water for me.

it turned out that the printed colour chart i have is incorrect compared to the older one used by the LFS. the testing result read with the LFS' chart is 7 instead or 7.5/8 when using my chart (and also a lot easier to read)... it seems that there's something wrong with the new printing. so my LFS will contact JBL for a new replacement chart for me.

*this failed colour chart is found in both JBL Ph test kit that sells separately and the Combi Test kit.*

the incorrect colour chart

7.5 or 8, what's the different?
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post #2 of 8 (permalink) Old 07-21-2012, 03:21 PM
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Also looks like 5.5 and 6 would be very hard to tell.
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post #3 of 8 (permalink) Old 07-21-2012, 03:47 PM
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Digital pH meter from Ebay or Amazon. Last's a lot longer, more accurate, can test many tanks at once. Ebay was less than $10 but it took a month to get here. Amazon is quicker but more expensive.

20g platy, , 2 x 10g shrimp, 3 x 20g shrimp, 7.5g shrimp and 1 great dane/mastiff puppy.

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post #4 of 8 (permalink) Old 10-12-2014, 09:58 AM
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same here!


I've just bought a JBL Combiset and I am experiencing the same issue.
Did you receive a better chart from JBL, and if yes, would you share it? ^ ^

Thank you,
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post #5 of 8 (permalink) Old 10-12-2014, 10:45 AM
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You have to use either 6-7.6 test or 7.4-9 from jbl to get decent accuracy
From 6-7.6 one I can easily tell my ph with 0.1 resolution
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post #6 of 8 (permalink) Old 10-12-2014, 10:48 AM
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You guys in Europe don't get API products?
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post #7 of 8 (permalink) Old 10-12-2014, 01:52 PM
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API has the same problem with its nitrate test.

Older color cards have a very distinct color shift between 10 and 20 ppm. The newer cards, it's impossible to tell.
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post #8 of 8 (permalink) Old 10-12-2014, 03:43 PM
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Originally Posted by FatherLandDescendant View Post
You guys in Europe don't get API products?
why would we want it when JBL has better resolution

the problem here is this particular test is ment for rough estimation of PH, not for CO2 tuning. for high accuracy readings this same manufacturer has differen test
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