Your plants can only gain access to all the minerals that they need if the nutrient solution supplied to them has a measure of acidity – or pH level – within a certain range (most varieties respond well to 5.5 – 6.0, some also prefer slightly higher). This highly reliable handheld device from Bluelab lets you closely monitor the pH value of hydroponics feeds by producing clear, quick and accurate readings on an easy-to-read backlit LCD screen. It is completely waterproof and works regardless of whether the nutrients are warm or cold thanks to automatic temperature compensation. In fact, the Bluelab pH Pen will even go so far as to indicate the actual temperature of the water! After taking into consideration other features like a low battery warning and an automatic off function, what you see here is the ultimate pH pen!
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