Xiaomi TDS Tester Pen Highly efficient and accurate due to its advanced microprocessor technology. Ease of Use Open the cover and put the end of the pen into the water. Click, you can check and then know the TDS of the water in your home anytime. Design Waterproof, low-power chips, detertable range 0-9990,0.0001 micron filtering accuracy. Advantages Compact and lightweight, the fuselage about 30g, only a pen size, easy to carry, built-in two AG13 button battery can be replaced, convenient self-replaceme
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