In this study, we present a method for absolute pH mapping using the guanidyl CEST signal. The method is an extension of a previous approach that allowed compensating for various concomitant effects other than pH, but additionally required measuring the amide signal. By optimizing the pulse shape of the pulsed presaturation the pH sensitivity of the guanidyl signal could now be shifted to the physiologically relevant range around pH 7.1. The shift of sensitivity was verified experimentally in a multi-pH creatine phantom at 9.4T. Thus, CEST-based pH mapping with exceptional specificity is now also possible using only the guanidyl signal.