Conductivity Standard Solutions are neccessary for periodic calibration of conductivity/TDS parameters to maintain accuracy. All are NIST tracebale for your complete confidence. Recommended Values: KCL-7,000 (7mS) 442-3000 (TDS), or NaCl-14.0.

pH Buffers are necessary for maximum accuracy of pH and ORP tests. Calibration with pH 7 buffer is especially important. All buffers are NIST traceable. Recommended Values: pH 7, pH 4, and pH 10 buffers.

Certificate of NIST traceability for either pH buffers or Conductivity Standard Solution (must be specified when solution is ordered). Model: SC.