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General Hydroponics uses the highest quality electronic meter reference solutions. Growers can use o..
$7.54
General Hydroponics uses the highest quality electronic meter reference solutions. Growers can use o..
$21.50
Calibration and conductivity standard solutions... a must in every grower's toolbox. The Bluelab ca..
$8.16
Calibration and conductivity standard solutions... a must in every grower's toolbox. The Bluelab ca..
$10.99
General Hydroponics uses the highest quality electronic meter reference solutions. Growers can use o..
$7.54
General Hydroponics uses the highest quality electronic meter reference solutions. Growers can use o..
$21.50
pH 7 is the most frequently used pH buffer. All Hanna solution bottles come with a pH vs. temperatur..
$1.40
The Hanna Instruments HI1333B is a combination (full-cell) pH electrode with a single ceramic juncti..
$60.95
The pH Control Kit by General Hydroponics provides everything you need for testing the pH level of t..
$17.20
This pH controller has been designed for easy, affordable installation in tight spaces, ideal for si..
$219.99
pH sampling assembly. Allows for more accurate readings. Sampling kit includes a submersible pump, 3..
$74.95
Professional pH controller especially designed for use with aquariums. Features user selectable Hi/L..
$201.99
Microbe Life Hydroponics pH DOWN is formulated with R/O and UV sterilized water and combines two pH ..
$14.95
Microbe Life Hydroponics pH DOWN is formulated with R/O and UV sterilized water and combines two pH ..
$24.95