Today I gonna review the Xiaomi Measuring Water Quality Purity Tester. The device determines the level of impurities in water and displays it in ppm.
PPM is the standard unit of measure that indicates very small concentrations – one in a million. In this case, content of impurities in water. 1ppm = 1 cm3 of impurities in 1 m3 of water.
Xiaomi Mi TDS Pen Tester detects the following substances in water:
You can use the table to determine the purity level of water:
It means, the less ppm the better the water. So, 0 ppm is the value of distilled water.
But that's the theory, in practice there are some nuances.
Xiaomi Mi TDS Pen Tester was delivered in its original packaging. High-quality printing and a small instruction on the back.
Inside the package there are the tester and a small Mi warranty sheet.
The tester comes fully equipped and ready to work right out of the box.
On the one side, under a cap, there are 2 titanium sensors and an additional temperature compensator.
On the center there are an ON button and a digital display.
On the other side there is a battery compartment for 2 batteries that were already installed by the manufacturer.
The device is easy to use. You should turn the device on and place it in the water. In a second it will display the purity level in PPM. If the scale is not enough (3 digits), the "x10" ratio icon activates, which means that the readings should be multiplied by 10.
So, let’s measure bottled water.
A 90 ppm value means that the water is clean and recommended for use. In practice, I haven’t seen a value below 50 ppm, but drinking distilled water won’t do much good. By the way, measuring of bottled water in the office displays around 80-90ppm.
Now let’s check tap water.
In the normal range, but that’s exactly the time to replace filters. There is an usual 3-cell filter in the kitchen. I take the new cartridges and replace the old ones.
Let’s check the result.
And now think what's going on. A ppm value achieved 175. Cartridges were replaced, but the water wasn’t cleaned up. The concentration of contaminants even increased. A few days later after replacing the situation hasn’t changed. Hence the sad conclusion – the filters are not high-quality. The value of tap water is almost the same as after the filters. I can't make other conclusion. Maybe in a month something will change, but I'm not sure.
Well, now I gonna measure the water quality directly from natural sources. Here, for example.
Find a spring, that is rich in iron (you can even see it in oxidation around the spring). This mineral water is recommended to drink at once, the next day it stinks of hydrogen sulfide.
And finally, let’s test water in a sanatorium, which is near another mineral spring.
The result is 409 X10 = 4090 ppm. The table strictly recommends us not to drink it, as the value exceeds the norm several times. But people come here for this healing water. Therefore, you can’t judge by these indicators only from one point of view. Although this level of impurities (salts) concentration in tap water will obviously indicate the problems with the pollution. On the other hand, for mineral waters it’s an indicator of its quality.
Finally, the level of mineralization in the same mineral water, but bought in a store located hundreds of miles away.
As you can see, the ppm level decreased slightly to 3010 ppm, but not critical, it is still very high. Perhaps this is due to pre-cleaning in the bottling plant, or a change during the carbonation of mineral water. I expected the bottled water to be much less concentrated than one from the spring, but it wasn’t so bad.
As a result, I’m satisfied with the tester. It displays stable results that speak of its quality. On the other hand, I would like to see not just the number of ppm, but the chemical composition of water.