General Hydroponics: Standard Reference Solution 4.01
$32.99
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...

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Estimated between and Will usually ship within 1 bussiness day. |
Additional Information
Size | 1 quart |
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