Soil test probe doesn't work at all (reads anything between 7-8, I've even tested it in vinegar soaked soil) Liquid pH tester needs calibrating before you can use it, which requires the use of pH buffer (not included) to bring the liquid to a specific pH for calibration (which you wouldn't know if your liquid had the correct pH value for calibration, without you there was already a way to check pH using another method, such as test strips). Just buy a test strip kit and save time.
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