Quote Originally Posted by BlueBear
OK, the buffer that you find in certain nutes help to stabilize that particular nute at a PH that it works well with, but sometimes the buffer in nutes can take the PH too low, for instance I use a nute with a built in PH buffer and it takes the PH all the way down to 4.5 sometimes and that being too low, I have to use my PH up and bring it back up to 5.7 or what ever I am wanting at that time. PH down helps when you have a PH that is to high, in hydro, 6.0/6.2 is around as high as you want to go IMO and staying under 6.0 is really best and above 5.3/5.5.
Those solution packages you got with your pen are for testing and adjusting your pen, after a while, sometimes a week, sometimes a month, it depends on the quality of your pen, you will want to test your pens calibration by poring that liquid into a little cup/bowl/lid of somesoart and placing the pen into the solution, the pen should read the same PH or TDS of the solution that you used, example, PH 4 solution you should get a reading of 4. The same goe's for TDS.
Hope this helps some
Adieu
So basically these packets are used to just tell you that your meter is in proper working order. Am I understanding you correctly? I guess I am a little confused as to why they have different amounts like 4.01 and 7.01 etc..