How do I use a Digital PH Meter pen?

[Guest]

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[MagicMike66]

I’ve never once calibrated a PH pen..

[MagicMike66]

I always use the pen I’ve just never calibrated any of them

[PLreef]

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.

[Rwise]

I calibrate my PH meter monthly per its instructions, its never been more than .1 off at either end of the scale.

[Ckbrew]

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.

[3Berries]

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.

[Puglover1]

Nebula suggests drying it with a very soft cloth after rinsing to wipe off any nute residue.

[Rwise]

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.

[Puglover1]

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.

[3Berries]

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.