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.
General Hydroponics 1500 PPM Reference Solution 8 oz
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- SKU: 3571
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