RF sensing of glucose dependent dielectric properties is emerging as an alternative non-invasive technique to the existing measurement methods. In this study, the dielectric properties of dextrose solutions are investigated with an open ended slim form dielectric probe in order to identify the most suitable frequency of operation for an RF sensor. Measurement results showed that at 500 MHz the dextrose dependent dielectric property discrepancy is higher. However, the role of the error introduced during dielectric property calculations is not investigated yet. Therefore, the S parameter responses will be studied for further verification.