$21.50 (as of February 18, 2018, 3:58 am) $15.77

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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SKU: GH1552 Category: Tag: