quick question regarding pH pen.

SparkUm

SparkUm

Active Member
can I use it without calibrating? I will be ordering the solutions but id like to give it a go.
 
I

Illegal Smile

Guest
it will come calibrated but should be recalibrated every week or so. You only need one solution, 7.01 calibrations solution. Use it for that and storage - fill a shot glass with it and keep the meter tip in it with cap on.
 
SparkUm

SparkUm

Active Member
Illegal Smile said:
it will come calibrated but should be recalibrated every week or so. You only need one solution, 7.01 calibrations solution. Use it for that and storage - fill a shot glass with it and keep the meter tip in it with cap on.
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I tested fresh tap water and it was 7.1, then tested my current feeding water and it was 6.0, its been laying out for a few days, so seems pretty accurate to me?
 
speedyseedz

speedyseedz

Well-Known Member
SparkUm said:
I tested fresh tap water and it was 7.1, then tested my current feeding water and it was 6.0, its been laying out for a few days, so seems pretty accurate to me?
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Make sure that after every use, you shake off any excess fluid within the sensor area, doesn't hurt to give it a little wipe.

Then you can leave it longer to calibrate. The more times you calibrate the more incorrect it gets. With micro build up around the sensor and micro particles of salt get left when water evaporates on the sensor, the calibration is still the same, just your reading it slightly higher, multiply this over several hundred uses and it gradually puts the meter out.

A good meter shouldn't need calibrating that often if looked after properly
 
SparkUm

SparkUm

Active Member
speedyseedz said:
Make sure that after every use, you shake off any excess fluid within the sensor area, doesn't hurt to give it a little wipe.

Then you can leave it longer to calibrate. The more times you calibrate the more incorrect it gets. With micro build up around the sensor and micro particles of salt get left when water evaporates on the sensor, the calibration is still the same, just your reading it slightly higher, multiply this over several hundred uses and it gradually puts the meter out.

A good meter shouldn't need calibrating that often if looked after properly
Click to expand...
cheers for the advice mate.

I'm going to order the solution 7 later today, but, just wondering, say I had a liquid that was a specific pH, and the meter read it wrong, by 2 pH, couldn't I just knock off the 2 and still have a fairly accurate reading.

Maybe thats a stupid question, I dont know, its all about learning though, and, I really appreciate the replies guy's.
 
I

Illegal Smile

Guest
SparkUm said:
cheers for the advice mate.

I'm going to order the solution 7 later today, but, just wondering, say I had a liquid that was a specific pH, and the meter read it wrong, by 2 pH, couldn't I just knock off the 2 and still have a fairly accurate reading.

Maybe thats a stupid question, I dont know, its all about learning though, and, I really appreciate the replies guy's.
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Sure, that's recalibrating in your head, but why bother? By the way, distilled water is 7.0 but is not good for storage solution.
 
SparkUm

SparkUm

Active Member
speedyseedz said:
how are you going to be growing your plants?
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I'll be growing 100% coco, as I have done on previous grows, I never tested my pH though and this obviously led to problems, so im relieved to have one this time around, overall im more prepared.
 
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