Non MDA & MDA OXI are same factory produce, SPEC is same. Difference: one come with MDA Box with brand name Surgiplus & one Non MDA Box, Model code are different only. Note: 1. What is blood oxygen saturation(SpO2)? Blood oxygen saturation(Sp02)is the percentage ot hemoglobin in the blood that contains oxygen -in other words,the amount of oxygen in the blood.It is a useful natural indicator of the condition of a person's respiratory system. The ideal range is between 95% and 100%,but this can be affected by your physical condition,altitude,and certain illnesses.lf your Sp0. level is too low it could indicate a health risk. Use the data below for reference: ≥90% 70%-89%