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Calibration Problems

My Value (PH) meter will not calibrate the 4PH liquid and shows a 4 then a 10, and gives me err1 when I short press to end calibration - is it serviceable? It did great for 7 months but now it's broke. I need it badly - my plants do. Which is your most robust unit for simple PH testing? I loved the meter - I'm gutted it's dead.
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