Duh, PH issues yet again

Currently on my 2nd grow, once i started ramping up the P&K two weeks after flip i had terrible problems getting my PH under control.
My bottle of PH down lasted weeks when the last bottle went for months...

Today i finally put my PH meter in a glass of water, ( its always 7 here ), and it read 8.6 !!!
For at least a month i have been feeding things far too acid.
Must remember to dunk PH meter in a clean glass of water once a week to check that it reads 7

Now in week 8 things seem to be going well, however too paranoid to post pics.

When was the last time you calibrated your meter?

You should keep calibration solution around, that way you can dip it in there and know 100% that it's accurate.

Never wrong.

MickFoster said:

Never wrong.
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I don't know about that...those shades of green can get a little weird...the color I got said my pH was low 7 high 6 range, but when I used my newly calibrated pen (calibrated in a wetlab where I work) the pen said 8.8

I even went back to the lab and recalibrated the pen the next day and got the same 8.8 the next afternoon.

I have 7.0 science PH fluid, but i payed science money for it so i hate wasting/using it lol. ( I have now found a cheap retail 7.0 fluid )

And since the local water is always 7.0, its awesome for calibrating.

I have a 3 point digital calibration meter and the sachets, but i wound up deciding that the dirt cheap screw adjusted ones were best for me.

I tested again, and it had already gone .4 back in the other direction, so im just going to have to remember to give it regular resets in 7.0