Chemical exchange saturation transfer (CEST) using iodinated agents has been tested for extracellular pH imaging on high-field animal scanners. However, the reliability in the pH quantification on low magnetic strengths remains elucidated. In this study, CEST imaging was performed on iobitridol phantom twice with a three-day interval at 3T. pH was quantified by ratioing iobitridol CEST effects at 5.6 ppm under B1 of 1.0 and 2.0 μT. Results show accurate pH quantification in both scans. Good consistency of paired measures was observed between the two scans, suggesting the reliability of the method and its potential clinical applicability at 3T.