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Soil moisture or pH test probes
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Soil moisture or pH test probes
Perhaps check your metres against something you know to be reasonably correct.
If you have such a device that you can test the moisture or the pH of the soil or MM you might have to do what I had to do this afternoon.
I hadn't used them since early March and they developed a dark tarnish on the copper probe.
This tarnish is an insulator , gives a high circuit resistance and thus affects the readings of the meter tremendously .
Simple use some soft wire wool or some very very fine wet & dry or some slightly abrasive stainless steel sink cleaner to clean the tarnish off so you get clean bright copper .
Doing this took what I knew to be sopping wet plants giving a reading of dry to what it should be at very wet ( I'd just watered them )
If you have such a device that you can test the moisture or the pH of the soil or MM you might have to do what I had to do this afternoon.
I hadn't used them since early March and they developed a dark tarnish on the copper probe.
This tarnish is an insulator , gives a high circuit resistance and thus affects the readings of the meter tremendously .
Simple use some soft wire wool or some very very fine wet & dry or some slightly abrasive stainless steel sink cleaner to clean the tarnish off so you get clean bright copper .
Doing this took what I knew to be sopping wet plants giving a reading of dry to what it should be at very wet ( I'd just watered them )
plantoid- Posts : 4096
Join date : 2011-11-09
Age : 73
Location : At the west end of M4 in the UK
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