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This handy Wassertec pH Meter allows you to take pH readings from closed water tanks, which can be a bit awkward with normal stick meters.
As well as allowing you to measure pH continuously, you can simply stick it down into one of the flower holes in your hydroponic system in order to get started, and leave it there among your plants for the perfect real-time reading.
Highly practical, spare sensors also available.
These pH meters need to be calibrating using their screw. Use a calibration liquid and adjust the screw until the reading is the same as your liquid.
Calibrate every 2 to 3 months.