General Hydroponics™ uses the highest-quality reference solutions, allowing growers to calibrate many popular brands of PH, EC and TDS meters (NaCl scale or the 442 scale). General Hydroponics™ technicians check each batch to ensure that our solutions are precisely calibrated and yield reliable readings each time they are used.
Recommended for the General Hydroponics® Meter Calibration Solution 4.01
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$19.99 | $24.99
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$19.99 | $24.99
Product title
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$19.99 | $24.99
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