Portable TDS meter (measures total dissolved solids)
Compact TDS meter. Comes with a case.
Digital LCD Water Quality Tester,TDS Water Testing Pen Purity Filter 0-9990 PPM Temp for Drinking Water, Aquariums and Swimming Pools (Blue)
Compact TDS meter. Comes with a case.
Digital LCD Water Quality Tester,TDS Water Testing Pen Purity Filter 0-9990 PPM Temp for Drinking Water, Aquariums and Swimming Pools (Blue)