For optimal performance, re-calibrate your meters periodically or if testing TDS or conductivity levels in wide or different ranges. Features: NaCl calibration solution, 342 ppm Comes in lightweight HDPE plastic bottles Sealed with a coated foam liner 3 oz. bottles (90 ml) Solution Conversions: 342 NaCl = 362 as KCl ; 478 as "442" ; 700 µS Price for Pack of 25 pcs
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