Stability of a measuring tool is very important. It is necessary to get measurement results that have high precision. This research was conducted to see the stability of Non-Invasive Blood Glucose Measurement Tool. Data of this research is data research from "Pengembangan dan Uji Klinis Purwarupa Alat Pemantauan Kadar Glukosa Darah Non-Invasif Institut Pertanian Bogor". This research used analysis of statistical process control using Individual Moving Range control chart. The results obtained indicate stability process on each respondent. However, among respondents who are one with other respondents has an unstable process despite glucose levels the blood of the respondents is the same.