Our list of the best pH / nutrient monitors / EC, TDS PPM / Temperature monitors that we use in our vertical garden grow tent!
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Bluelab pH 4.0 & 7.0 Calibration Solution Kit – pH Meter & pH Pen Calibration for Balanced Nutrient Solution NIST Traceable | Hydroponics, Gardening & Growing Tents (500 ml/ 16.9 Fl Oz Each)
$39.99
