A short diatribe about soil pH testers, and how much do you trust one?
I've been using a cheap Chinese jobby for my outdoor grows and it's done me fine up to now. But during my recent shopping-extravaganza buying new kit, I decided to upgrade to a decent, more-expensive one. And a more accurate one too, hopefully.
First use, I shoved the probe into my potted babies in the veg chamber .. reading came back pH 3.5 ...! Huh?
Surely not, they'd be dead by now if that was true, and they look very much alive and kicking to me.
So I then shoved it into a freshly-opened bag of Plagron soil ... pH 3.5
A glass of tap-water ... pH 3.5
Some sand ... pH 3.5
A cow's arse ... pH 3.5 ... (which is ludicrous because as everyone knows, a cow's arse is pH 6.2!)
I don't think it was a crap brand, just a bad unit. The company didn't quibble, instant refund.
But my point is, it could have cost me dear if I'd trusted the first reading ...