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pH pen issue...
GrowingGranniestarted grow question 2 years ago
I've got two pH pens... one from Vivosun, the other one is Apera... I calibrate both of them on the same day, same time... one reads my nute solution at 6.3, the other 5.7. What would YOU do?
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Papablobanswered grow question 2 years ago
Oui ca fait un moment que je vois écrirte des valeur de ph très précise. Alors que le meilleur pH-mètre de labo que j'utilise au boulot (très cher) n'est en définitive pas a 0.1 prés. 0.2 serai plus juste, et cela fraichement étalonné. Le ph et fonction de la température aussi. Une précision de 0.5 ( à 20°c ) ne m'étonne pas. C'est même pas mal pour des pH-mètre pas cher.
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AsNoriuanswered grow question 2 years ago
granny, then you do it wrong, test them on calibration solutions, don't throw them out.
Calibrate. Turn off both, same big glass of tap water. both in - reading.
turn off. both to 4.0 calibration solution. reading
turn off. both to 7.0 calibration solution . reading
if any lies to calibration - this one is dead. small drop while delivering, could make your meter bad from the start.
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Organomananswered grow question 2 years ago
Use both and split the difference! ^(that would do my head in though!)*
Or....pick one pen and never use the other.
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Mr_Weeds_Autosanswered grow question 2 years ago
Go old school and get General Hydroponics pH Test Indicator, it never fails. I always test with my pen first then test again with the drops just to ensure I'm getting a correct reading.
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ClydeGrowsanswered grow question 2 years ago
Had the same issue so I said fuck pens (unless you have hundreds of bucks to spend, and then the pens become decent again haha)
For less than I got a root farm pH test kit that uses a sample plus drops. Very accurate, very cost-effective. I'm not looking back! I think you can get similar tests for aquariums so lots of brand options out there 😎 good luck
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