How to measure the acidity of the soil almost toy

It's going about this device:

The measurement of the acidity of water, it is necessary to make a correction in the determination of soil acidity on it. I testify water pH ranged from 5.5 to 6.0

Thus, the device has tested, I can tell a lot about him interesting. Of course, it is a pity that in Russia and China is only able to sell, and buyers do not respect the learned. Instructions, not even a primitive description of the principle of no work. However, we are used to include a head.

Measuring Panel

Simultaneously shows one thing, pH, humidity or light. You can switch the device during the measurement and see the other figure.

It is the same pH reading from the top photo. I think it's 6.0 for the bottom straight scale

We switch three positions: Right - pH (soil acidity), the middle soil moisture, the left light. Last without specifying units. What to do with it, I do not know. Eyes that there is no, what coverage? About the rest I will write.

Acidity define the lower horizontal scale. Right she is written: 3.5, 8 left. This means that in acidic soils arrow deflected to the right, to the left of alkali. Considered neutral pH 7.0.

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Imagine that many make the mistake of measuring the pH of medium scale. That's without instruction.

The average scale for determining the humidity: the red is dry, normal green, blue just been watered. Sense moisture measurement at a depth where they can be surprises.

Principle of operation

Probes of different metals. I seem to aluminum and steel. Although copper and steel written on the box. It happens:)

Perhaps we are dealing with a voltmeter, a calibrated specifically.

Immerse the probes into the soil or water
They electrified, each in its own way, as different metals.
An emf (electromotive force)
It measures the voltmeter

My measurements

Here are the purchase peat with acidity, spelled out on the packaging:

he was wet to the touch.

Trying to measure the acidity in the loose soil was futile.

Compaction in the measuring point has not helped.

I poured a little water went metering process. Arrow left gradually deflected about 1 minute.

Result:

The acidity of not less than 4.5, so it is possible to plant blueberries and cranberries in pure peat. Then fertilize.

And this is one of the measurements about clematis:

Here I spent the measurement point. For every 2 cm readings are different, run in 1.5 units. It is normal for the soil, have a volatile acidity. So one should always make multiple measurements and averaging.

As it is necessary to measure and why

Probes before each measurement should wipe paper or cloth, for greater certainty nazhdachkoy nulevkoy (without fanaticism). Because probes can be covered with an oxide film. After nazhdachki cloth wipe.

Nulevka sandpaper for smoothing of the probes before measurement

Insert probes to the maximum depth. Sometimes it turns out to measure down to 4-7 cm, but not always.
The ground should be compacted in place for measuring the maximum contact
In insufficiently moist soil measurement may not be possible, then just mean water and wait a bit.
Indications must be removed after about one minute after installing the probe.
The light source is not close.

And you have such a device? What did you think of it?

I would be grateful for a subscription and chat :)