The end-product of most analytical laboratories is data. It is therefore imperative that the quality of the data produced meet or exceed performance criteria. The implementation of Quality Control (QC) processes helps control error and estimate uncertainty. QC can be a tool in method development, regulatory processes, laboratory training, and performance monitoring. QC samples can help an analytical laboratory determine its precision, accuracy, linear range, and method ruggedness. QC samples allow the laboratories to fulfill documentation requirements as well as correct errors in root case analysis of a possible failure. Finally, QC samples monitor the effectiveness of the laboratory analysts to produce accurate data.

A 250 mL ready-to-use sample packaged in a HDPE bottle to be analyzed for:  Calcium 10 - 100 mg/L, Magnesium 4.0 - 40 mg/L, Total Hardness 40 - 415 mg/L, Calcium Hardness 25 - 250 mg/L. Exact values are documented on lot COA.