The presented work is a low cost “off-line” method that is able to evaluate the precision of mobile robot localization, which is a difficult task. A reference path is yielded by a drawing pen attached to indoor mobile robot, which also adds timestamps to the trace on the floor. The method is based on comparing the reference path obtained using photogrammetry, with the results of several localization algorithms on board of mobile robots. At the moment, different techniques exist that deal with that problem, but these are either expensive or too rigid.