Custom45
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Are the probes clean and how old is your calibration solution? Do you have cal 4 solution? Typically you calibrate both.Hi,
So I currently have 2 ph pens/meters, both decent quality. They both calibrate well in 7 solution and read 7 just fine. But when dipped in tap water or nutrient solution there's a big difference in reading between the two (one reads 5.8 the other 6.5). I can't understand why they read the 7 solution just fine, but then get wildly different readings in anything else.
I don't know which one is correct or which one to trust?!
Probes are clean, yes. Solution is about 1 year old, just have the 7. I'm ordering some more and will get a 4 and 7. I'll get some of the storage solution too.Are the probes clean and how old is your calibration solution? Do you have cal 4 solution? Typically you calibrate both.
You haven’t finished the calibration process with only one cal standard. The stuff also starts going bad after 3 months.Probes are clean, yes. Solution is about 1 year old, just have the 7. I'm ordering some more and will get a 4 and 7. I'll get some of the storage solution too.
I just find it odd that they both read fine in the calibration solution, but read different in anything else.
Sorry, can’t agree. More than once I’ve worked at a place that supported users around the world. We had 3 or 4 clocks on the wall for each time zone.A man with two watches never knows what time it is.
your asking whether his ph pen has a cap for storage solution?If they have a screw on or some way to hold a little cup on the tip, that is a pretty good indication.
Saying that if it does it is an indication it is supposed to be kept wet.your asking whether his ph pen has a cap for storage solution?
Drops from a fish place are more reliable than a cheap pen, now you want to spend 100+ there’s some nice stuff that still needs maintenance drops have worked for me for like 5$ for a years wort
Saying that if it does it is an indication it is supposed to be kept wet.
If OP lists the specifics of the equipment I could be sure. There is more than 1 PH probe style, and the more expensive ones are more accurate but require care.
Get it in storage solution (KCL) and let it sit for a few days before you calibrate. It may reset itself. Let us know your results.Sorry, one is a Bluelab pen, other is an Apera ph20 pen. I think both should be stored wet in solution, but I only recently found that out and haven't been doing so.
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