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Collection:

pH, EC, TDS, and PPM Control

54 products
General Hydroponics pH Test Indicator 8 oz
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HI7031-023 is a GroLine 1,413 µS/cm conductivity standard that is prepared against a NIST traceable potassium chloride solution and supplied with a certificate of analysis. Hanna conductivity...
The spare pH sensor is designed as an easy-fit cartridge that locks into place, featuring two o-rings to maintain a watertight seal. With no pins to line up or that can break, this sensor is ...
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One of the best meters for hydroponics, our GroLine Waterproof Portable pH/EC/TDS Meter (HI9814) is a must-have for growers. Easily manage and monitor your growing nutrients with this customer favo...
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HI70300-023 is a GroLine storage solution prepared with reagent grade chemicals that can be used to ensure optimum performance of your pH and ORP electrodes. It is necessary to store a pH electrode...
The HI98331 Soil Test™ is a pocket tester specifically designed to directly measure soil conductivity (EC) and temperature. With a compact size, single button operation, and automatic calibration,...

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