For optimal performance, re-calibrate your meters periodically or if testing TDS or conductivity levels in wide or different ranges

NaCl calibration solution

Comes in lightweight HDPE plastic bottles

Laboratory quality NIST-traceable solutions

Any brand TDS meter can be calibrated to any brand of calibration solution

Bottles have a convenient wide mouth, allowing a user to simply insert the meter into a stable bottle

Sealed with coated foam liner