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How do I use a Digital PH Meter pen?

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I calibrate my ph pen every other week. Any longer and I could run into problems that in my eyes are not worth having. Too easy of a solution. Some people have great water out of their taps and never need to deal with or check ph. Folks running living soil don't either.
 
My water source is stable and I keep accurate records so I don't need it often. When I do use it I calibrate it BEFORE using, it will drift during storage. Keep a jar of calibration solution on hand, no need to mix up a fresh batch each time. Rinse it well after use, distilled water preferred but not mandatory unless you have very hard water.
 
Make sure you rinse it, then shake off any rinse and use a 7.0 standard to store the meter in. Then as long as it reads 7.0 with the standard it's good to go usually.
 
My unit requires both 4.0 and 7.0 or 7.0 and 14.0 (IIRC since I dont use that one), and another fluid to store the prob in.
IDK anything about the pen you have.
 
If I (was growing) mix up a couple gallons of pH'd water ahead of time does the pH remain stable? Thinking ahead, trying to avoid another disaster. All I needed was some water ready and I'd be checking trichs soon. My friend used an old bottle of Spring water, no idea of its status, and she didn't use enough. I had 2 gallons of dechlorinated water on the kitchen counter, it would've been better at the tap's pH than what happened.
 
Use what is recommended for your unit. Different pens use different solutions. There is usually one near neutral, one acidic, one basic. Usually u only need the high & low solutions if you want a more accurate reading to 2 decimal points. I have found that using the one near neutral has been adequate for my pen, its just a chepo.
 
Big thing with the pens is the bulb sooner or later needs changed or you need a new pen. Mine can do a three point calibration if you have the standards. it comes with 4.0 and 7.0.


Apera Instruments AI209 PH20 is what I have and it is not replaceable.
 
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