Bluelab pH 4.0 Solution Sachets (30) Shipping Improve your air quality with

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Bluelab pH 4.0 Solution Sachets (30) Shipping Improve your air quality withBluelab's 2. 77EC Conductivity Solution, pH 7. 0 and pH 4. 0 Calibration Solutions are now available in 20ml sachets. pH measuring equipment must be cleaned and calibrated regularly to ensure they are giving the user accurate readings. pH instruments are calibrated to pH 7. 0 first (buffer) then to pH 4. 0 (slope). The 2. 77EC Conductivity solution is used as a reference or checking solution to ensure you have adequately cleaned the EC CF probe.