Bluelab pH Pen - Hydroponics Nutrient Calibration
The Bluelab pH Pen provides a compact, quick, handy and affordable way to manage the success of your plants and ensure maximum uptake of nutrients.
Specially developed as an affordable and effective option for hobby gardeners.
Measures pH and temperature
Selectable units for centigrade and Fahrenheit
Backlit LCD display
Double junction probe (not replaceable)
Successful pH calibration indicator
Low battery warning
Auto off function
Automatic temperature compensation
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