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Is your conductivity instrument adequately cleaned and giving accurate results?
Most of Bluelab’s EC/ppm equipment does not need calibrating as they are all factory calibrated here at Bluelab (except Bluelab EC and ppm Pens). The 2.77 EC solution is used as a reference or checking solution to ensure you have adequately cleaned the EC/CF probe.
To ensure solutions remain accurate:
Bluelab solutions are manufactured specifically for Bluelab products are NIST certified and are made to a traceable standard to ensure your Bluelab products last longer and maintain accuracy.
The bottles pictured here may look different in some countries.