EC/TDS correct calibration solution # higher than the trimmer can reach. The PH deviates by a full point compared to the dip strip.
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Portable digital multimeter with sound continuity and thermocouple (electric tester) LTX DT-838
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80 Pieces Water Test Litmus Strips Litmus ph Paper Soil Acidity Meter Liquid pH Tester 1-14
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Efficiently Test Your Antifreeze And Battery Acid With A 3-In-1 Refractometer
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