Are the liquid type PH test kits accurate?

Understanding Soil pH and Testing Methods​

Measuring the pH of soil or hydroponic solutions is crucial for maintaining nutrient availability to plants and promoting healthy plant growth. The pH of the growing environment determines the accessibility of essential nutrients, and when outside the preferred pH range, nutrients can become locked out, potentially leading to deficiencies. There are three main types of soil pH testers: electronic meters, indicator test strips, and chemical-colored dyes. However, it is important to note that pH is measured on a logarithmic scale, and garden-grade pH testers may not be accurate enough.

pH Testing Strips and Their Limitations​

pH testing strips are cost-effective and provide quick results, but they may not always be accurate due to their broad testable pH range, and they are designed for single-use only. True litmus paper is extremely inaccurate and useless for measuring soil pH, while pH test strips are a more reliable option. Nevertheless, it is recommended to either opt for a professional lab test or seek advice from local gardeners for better accuracy.

Using Soil pH Test Kits​

Soil pH test kits are affordable, efficient, and user-friendly. They can help determine whether your soil is acidic, alkaline, or neutral, allowing you to garden more effectively and select the right plants. To obtain accurate results, collect soil samples carefully, avoid contamination, and take readings as soon as the specified time has passed. Soil pH test kits can be found at most garden centers, DIY chains, and online retailers.

Liquid pH Test Kits and Electronic pH Testers​

Liquid pH test kits offer a budget-friendly alternative to expensive electronic meters, providing results accurate enough for most growers. Electronic pH testers can provide extremely accurate readings when calibrated, but they may be costly, and their probes are prone to failure. Liquid pH test kits are quick, reasonably accurate, and inexpensive, making them an excellent backup option.

When using liquid pH testers, remember to use a white background for color comparison, as non-white backgrounds can alter the color and affect results. Additionally, ensure that color comparisons are done under natural light or standard household lighting, rather than HID lights, as the red/blue spectrums can cause significant variations in the appearance of the solution.