If you’re looking for an ultraportable pH meter, this one by Luster Leaf Products is an excellent choice. It uses a single probe to measure your soil’s pH. The interface is also easy to read. It can measure soil pH ranging from 3.5 to 9, which is a considerable range and can be a beneficial pick if you’re using it for plants that prefer alkaline soil.
This pH meter is quick to measure your soil and is best for outdoor use. It doesn’t use batteries or a standard power source, adding to its portability. As a bonus, it comes with a manual indicating the pH preferences and the watering needs of different plants you may be growing. For the size and simplicity of this meter, it’s a great on-the-go option for measuring your soil pH.