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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
HM Digital TDS Calibration Solution can be used periodically to re-calibrate your TDS meter or Water Quality Tester.
TDS Calibration Solution Specifications:
342 NaCl = 362 as KCl, 478 as "442", and 700 ÁS
Also known as Water Tester Solution, TDS Meter Calibration Solution, TDS Calibration Solution