Introduction: The study compares contractions of pelvic floor muscles of female physiotherapists examined per vaginam with the results of the tests presented using Peritone device. Materials and methods: 23 female respondents were tested and evaluated as a correlation between the muscle strength P within the PERFECT scale and the measurements of maximum voluntary contraction using Peritone device performed by two examinators. Results: The diff erences in the results of the study using two methods were not statistically signifi cant. There was also no signifi cant diff erence in two independent examinations of the pelvic fl oor muscle strength performed by two physiotherapists. Conclusion: Based on the results of our study we can state that female respondents of our study were assessed from the viewpoint of pelvic fl oor muscle strength expressed by the means of the PERFECT scale referring to good results.