ph probe meter

Just wanted to ask a few questions so people wait for the flashing ph led before calibrating again or just every few months also I've been leaving the probes in the nutrient solution and cleaning them only when it looks like I need to clean my reservoir I used 3% hydrogen peroxide to clean the...

So I’ve been trying to test my soil ph and it’s driving me insane. I have a cheap soil probe that doesn’t really work. I stab it into the soil, it flickers like 7.4 or 7.8, then flips back to 7.0. I even just pulled some soil out, added distilled water, and tried it. Didn’t even read.. just...

Was searching around and currently torn between grabbing one of those cheap $15 or so items from the hardware story - but they are cheap junk I presume? Reliable/accurate at all? I'm getting mixed stories from searching forums and websites. Currently I see 3 contenders .. this XLUX T20B...