Probe-type Ph Testers - Any good?

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Hesse2509

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Probe-type Ph Testers - Any good?
« on: March 04, 2012, 18:56 »
The title of the thread asks it all really, but just to clarify I mean one of these:



I bought one from Aldi the other week, but what causes me to doubt if they're any good is that I can get massive difference in readings within a few inches of each other (although I do get the same reading in the same spot if taken at different times). I figured the way to get an accurate reading for a particular bed was to take about 10 readings over a 10' by 4' patch and then take the average. Normally about seven out of ten readings come up roughly the same as ever so slightly acidic.

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Yorkie

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Re: Probe-type Ph Testers - Any good?
« Reply #1 on: March 04, 2012, 20:12 »
It is generally said that the test tube ones are more reliable than the probes; if I recall correctly the probes rely on the moisture level being sufficient in the soil??
I try to take one day at a time, but sometimes several days all attack me at once...

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8doubles

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Re: Probe-type Ph Testers - Any good?
« Reply #2 on: March 04, 2012, 20:33 »
I think that for the probe types to be any good you need to spend several 100s. The cheap ones are no better than litmus paper.

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mumofstig

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Re: Probe-type Ph Testers - Any good?
« Reply #3 on: March 04, 2012, 21:43 »
I sent one back to the supplier because I thought it was faulty, the replacement was no better, so I think they're a waste of money  :(
Lesley x
I'm not good, I'm not bad - I'm just me, and sometimes I have to apologise for that ;)

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Vit

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Re: Probe-type Ph Testers - Any good?
« Reply #4 on: March 07, 2012, 10:20 »
I think that for the probe types to be any good you need to spend several 100s. The cheap ones are no better than litmus paper.
You have to calibrate pH meter first with mixes from set and, of cause, made mixes with distilled water  ::) I have cheap pH-meter with glass electrode, but it' working good enough. By the way it have to be stored in distillated water, covering electrodes.

Toy on the picture will show you weather or harvest of bananas in pacific islands, but not pH



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