That's one chemistry that makes you a better living. Liquid tests are always more precise than strips and, when it comes to pH, probes. However, I always found it a hassle to have to run two pH tests with standard API master kit, as they have separate reagents for low and high pH. This one gives great color scale from 5.0 to 9.0, only 5 drops, and has a very reasonable price. I haven't used my pH probe in months now.
Pour 5 ml of water sample into the marked test-tube, add five drops of chemical, cap and mix, then compare it to the color chart.
The card has scales/colors of 5.0(orange/red), 6.0, 6.5, 7.0, 7.5, 8.0, 9.0(blue) easy to tell the pH difference unless you are colorblind.
I have added the acetic acid and sodium bicarbonate to water samples and observed the color changes, so I know this thing work. Also, I have tested it with water samples with known pH, the accuracy is pretty good.
The only downside is it doesn't come with an expiration date.
For an amateur aquarist like me, this is the startup kit.
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