The purpose of this research work was to compare the conductometrics with the Propex Pixi electronic apical locator and the YS-RZ-A apical locator. The type of research was quantitative, quasi-experimental design, comparative descriptive, cross-sectional. The sample consisted of 20 premolar teeth. The results that stood out the most were: The average of the measurements of the conductometrics with Propex Pixi was 17.68 mm. The mean of the conductometric measurements with YS-RZ-A was 17.50 mm. The most frequent conductometry with LAE Propex Pixi was 16.00 mm; followed by 19.50mm. The most frequent conductometry with LAE YS-RZ-A was 17.00 mm; 18.00mm and 19.00mm. The average measurement at the apical foramen with LAE Propex Pixi was 18.68 mm and at the anatomical foramen it was 19.10 mm. The average measurement at the apical foramen with LAE YS-RZ-A was 18.50 mm and at the anatomical foram...