Bluelab pH Pen field this recipe is one even

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Bluelab pH Pen field this recipe is one evenThe Bluelab pH Pen is a handy option for hobby and small scale hydroponic growers. Maintaining proper pH levels is key in raising healthy, fruitful plants, and this pen accurately measures both the pH and temperature in hydroponic systems. Its fully waterproof and also features a backlit LCD with the option to display in Celsius and Fahrenheit, double junction probe, successful calibration indicator, hold function, low battery warning, auto off