Amazon.com : bluelab pH Pen-Digital pH Tester - Reliable & Accurate for High Yield Crops - Hand-Held Meter - Measures pH & Temperature in Solutions and Soil Solutions - Optimize Plant Health
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![How to calibrate your Bluelab pH Pen or Probe [+ video]](https://i.ytimg.com/vi/Mvaa4Jrl0MU/maxresdefault.jpg "How to calibrate your Bluelab pH Pen or Probe [+ video]")
How to calibrate your Bluelab pH Pen or Probe [+ video]
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Is this how a NEW Bluelab pH pen is supposed to arrive? This is the replacement for the first one i bought that looks the same : r/Hydroponics
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