This document introduces the low sodium measurement method for D10P-06 kit. The kit includes Dual Star dual channel pH/ISE benchtop meter, 8411BN sodium ion electrode, 800500U Ross reference electrode and other equipment and solutions. The preparation method of calibration standard solution and the storage requirements of electrodes are provided. The measurement precautions include using high-quality plastic containers, using fresh standard solutions, avoiding interference from hydrogen ions, etc. Suggestions for using direct measurement method and known addition method are given, and the importance of reducing sample-air contact is emphasized.