HM Digital TDS 1000 ppm calibration solution - 20 packets of 20 ml
20 Pack Sodium Chloride(NaCl) EC/TDS Calibration Solution
(20) packets of 20 ml 1000ppm / 2mS / 2000 µS solution
(20) packets of 20 ml 1000ppm / 2mS / 2000 µS solution
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