A Few Words About Drop-Based pH Tests

Objectively, drop-based tests are the best method for measuring pH in aquariums. In our previous article, we explained in detail why this is the case. However, it is important to understand the differences between drop-based tests, as there are several factors to consider.
One key factor is the available pH measurement scale. The scale can cover a broad range, such as pH 3 to pH 10, or a narrower range, such as pH 6 to pH 8.

What Is the Difference, and Which Scale Is Preferable?

The pH scale is logarithmic, meaning that a change of 1 pH unit represents a tenfold increase or decrease in acidity or alkalinity. Even a shift of just 1 pH unit is already quite significant.
Additionally, most freshwater aquarium fish thrive within a pH range of 5.0 to 8.0. Therefore, when selecting a pH test, it is advisable to choose one with a measurement scale that falls within this range, such as pH 5 to pH 8.
Otherwise, a broader measurement range leads to larger increments between measurement points, reducing accuracy. Tests with a scale of pH 3 to pH 10 will have a significantly higher margin of error compared to tests with a narrower range of pH 5 to pH 8.