Works well, tines are always difficult to keep clean so use caution when testing. I will advise anyone growing outdoors to plow the original soil and add dolime, which will automatically bring the soil pH back to neutral. The cup testing method works to a degree, but in most cases it is best to plow directly into the soil, soak and test. Using distilled water is questionable as it typically has a pH below neutral. Using a batch of 7.0 neutral water will have less effect on soil pH once it is saturated. Indoor: You need to measure the pH of the soil where your roots sit. , measure the topsoil and, if possible, also the root level. If you take the soil out of the grow container to test, you will not get the right root soil pH and will disrupt your root growth. It's best to first soak the soil in a pot of neutral filtered water and test directly in the container. Great product for the price :) 4 stars
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