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For optimal performance, recalibrate your meters periodically or if testing TDS or conductivity levels in wide or different ranges. NaCl calibration solution. Comes in lightweight HDPE plastic bottles. Sealed with a coated foam liner.
GH pH Up Liquid Gallon (4/Cs)
Bluelab pH Pen
GH pH Down Liquid Gallon (4/Cs)
Bluelab pH Probe KCI Storage Solution 250ml Case of 6