PH Soil testing made simple! Most soils have a natural buffer for nutrients and pH, but when it goes wrong, it goes really wrong and fast! Yellow leaves, stunted growth, slow growth, are all signs that the plant is not getting the nutrients they need from the soil. This is often caused by "lock up". This is a situation where the plant loses the ability to absorb specific nutrient elements because the pH value of the soil is incorrect. This needs to be dealt with quickly, so the Blue lab Soil pH Meter is exactly what you need. This handheld meter comes with a replaceable Soil pH Probe and instructions for measuring direct into soils or measuring a soil solution. Used for cropping, pasture, turf culture, containerized plants, home gardens, orchards, tree farms, greenhouses, propagation culture. Anywhere that involves growing plants in soils. The replaceable soil pH probe can be used to measure the pH value of solutions or nutrient mixes too!.