Conductivity Standard, 10,000 μS/cm (10 mS/cm) at 25°C, Ricca Chemical, 5400 ppm TDS as NaCl, Pack of 6

$ 255.36

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Conductivity/TDS Standard, 10mS/cm (10,000µmho/cm) at 25°C, 5400ppm as NaCl, Ricca Chemical