Bluelab - PH Pen Green Planet Unfortunately they do not distinguish

Unfortunately they do not distinguish between the “bad biology” and beneficials

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Potting Soil

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T Perlite (Application Guide)

Bluelab - PH Pen Green Planet Unfortunately they do not distinguishA compact and robust user friendly handheld pen which takes measurements in increments of 0. 1 pH and is fully temperature compensated to ensure accurate readings every time. Fully waterproof rather than merely water resistant, the Bluelab pH Pen is designed to float if dropped into a reservoir. Temperature display in C or F selectable. Hold function keeps the pH reading on screen for as long as required. Easy to calibrate, and calibration check mark