either my ph meter is bad or...

hairmetal4ever(Z7 MD)April 1, 2014

OK, so I have a Rapidtest pH meter. As I have said before, it rarely works in a soilless mix, but I can get a reading if I take a handful and compress it around the metal tip.

My 5-1-1 is reading between 7.8 and 8.4 - this CANNOT be right, can it? I put half the recommended lime (since I used MG instead of pure peat). The MG itself is 6.5, pine fines are about 5ish from what I understand (I will open my remaining un-altered bag of pine fines and test it today) so unless I got some mutant super-concentrated lime somehow, something isn't correct...has anyone else experienced this? Heck, even PURE lime isn't much above the upper 8's, is it?

Thank you for reporting this comment. Undo
nil13(z21 L.A., CA (Mt. Washington))

The only pH meters I have ever trusted are the lab ones with a glass probe. The metal ones have to be cleaned before every use with steel wool or a scotchbrite pad in order to remove oxidation.

    Bookmark   April 1, 2014 at 11:09AM
Thank you for reporting this comment. Undo
hairmetal4ever(Z7 MD)

Would the oxidation cause a false reading, though, or just NO reading?

    Bookmark   April 1, 2014 at 12:34PM
Thank you for reporting this comment. Undo
hairmetal4ever(Z7 MD)

I took some steel wool to it. Still weird. The straight pine fines read 7.5, the MG mix about the same. Even straight household vinegar is reading 5.6 and should be 2.47 IIRC.

I think it is way off.

    Bookmark   April 1, 2014 at 9:40PM
Sign Up to comment
More Discussions
Meyer Exploding in 5-1-1
My meyer lemon in 5-1-1 is just going nuts right now....
Jay Part Shade (Zone 10B, S21, Los Angeles)
Help with 1:1:1 - weight and sourcing in the UK
I've just clicked that weight is going to be an issue...
containergardenerbeginner
Any issues planting in copper pots?
I have some old copper containers I want to use for...
garden_dogs
aphid issue + not many predators
Hello, dear Container G people!!! So, let me know if...
Need2SeeGreen
Need advice for container garden for elderly woman
I have a question on container gardening for an elderly...
sharonkdr
© 2015 Houzz Inc. Houzz® The new way to design your home™