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Bluelab® pH Pen, Digital pH Tester & Hand Held Temperature Meter Water Filtration Flower absorbs just the rightBluelab pH Pen Digital pH Tester Reliable & Accurate for High Yield Crops Hand Held Meter Measures pH & Temperature in Solutions and Soil Solutions Optimize Plant Health & Performance, White The Bluelab pH Pen is a user friendly and hardy handheld pen will take measurements in increments of 0. 1 pH and is fully temperature compensated, so you can expect accurate readings every time. About this item A hardy, compact pH and temperature pen that: