The performance of conductivity probes are affected by use due to residue build up and aging. MA9062 is a lab grade 1382 ppm TDS conductivity solution standard prepared against a NIST traceable potassium chloride solution that allows you to recalibrat

Bluelab pH 4.0 Calibration Solution 500 ml "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). Calibratio

Bluelab pH 7.0 Calibration Solution 500 ml "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). Calibratio

Product Details NaCl calibration solution 1000 ppm comes in lightweight HDPE plastic bottles. Sealed with a coated foam liner.