| Brand | TECHTONGDA |
|---|---|
| Features | Portable |
Check the listing for details. 1 PC TDS Water Quality Testing Pen Portable Water Quality Testing Tool New. Condition: New. Listed at 6.77 USD. TDS represents the total soluble solids content in water, and the lower the TDS value, the purer the water quality. (Note: The above refers to the international standard for direct drinking water!). F unction: Detecting TDS values.
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