by General Hydroponics
(2)Buy new: $8.85
8 used & new from $6.94
(Visit the Best Sellers in Soils, Fertilizers & Mulches list for authoritative information on this product's current rank.)
General Hydroponics uses the highest quality electronic meter reference solutions. Growers can use our reference solutions widely among many popular brands of meters using the NaCl scale. General Hydroponics technicians check each batch to ensure that our solutions are exactly calibrated each time they are used.
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