Problems Reading API pH Test - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 03-05-2016, 04:42 PM Thread Starter
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Angry Problems Reading API pH Test

Okay anyone who is familiar with this test may be able to help me out, no matter what time of day or night I test my water with the high range solution the tube turns bright orange - not light brown, not bronze - orange. That says 7.8 on the high range.

The regular range solution is the only one that changes from about 6.8/7.0 to 7.6 (blue).

- Why does the high range never read 7.4 (bronze) if my normal range reads 7.0?

- Should I just use the normal rage pH solution?

- If the range is dark green-blue I am good as long as the high range is orange?

Thanks!
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post #2 of 7 (permalink) Old 03-05-2016, 05:49 PM
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Do yourself a favor and get a PH pen with calibration solution. The liquid PH kit is a terrible way to get PH readings.


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post #3 of 7 (permalink) Old 03-05-2016, 06:14 PM
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Originally Posted by PortalMasteryRy View Post
Do yourself a favor and get a PH pen with calibration solution. The liquid PH kit is a terrible way to get PH readings.
Can you elaborate on the difference please. I just got a probe, calibrated it and was surprised to find the results are .5 lower with the monitor than with pH solution. I don't understand how this could be?
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post #4 of 7 (permalink) Old 03-05-2016, 09:27 PM Thread Starter
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Really? I thought API liquid test kits were the best way to go? Has to be much better than a pH test strip, but I was not aware there were better ways. It is really frustrating, because my Nerite snails die and Amano shrimp do fine.
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post #5 of 7 (permalink) Old 03-05-2016, 10:14 PM
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A PH pen has a resolution of .1 or .01. which is better than getting .5 readings of the PH from test kits. Liquid kits are also a bit harder to read the color sometimes.

Even if you purchase a cheap PH pen ($20) as long as you calibrate it before you use it then you should get pretty accurate PH readings.

Liquid PH or titrations kits are the next step if you don't want to use test strips. I abandoned PH liquid kits after I realize that it is impossible to get the readings that I need. I even have a liquid PH test for my expensive photometer but I don't use it. I now always use a PH meter.

@Ben Diss: I will always trust the PH meter vs. a liquid PH kit. Especially if your PH monitor is properly calibrated.


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post #6 of 7 (permalink) Old 03-05-2016, 10:33 PM Thread Starter
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Can you recommend a meter? eBay has them for $10 with a free TDS pen.
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post #7 of 7 (permalink) Old 03-05-2016, 10:42 PM
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Can you recommend a meter? eBay has them for $10 with a free TDS pen.
Thanks for this heads-up. I was just about to order both of these separate and didn't know of this deal from Ebay! Thanks!

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