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pH pen issue...
GrowingGranniestarted grow question 3y 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 3y 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 3y 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 3y 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 3y 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 3y 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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