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The aim of this in vitro study was to compare the capacity of the Root ZX-II and Mini Apex Locator, electronic apex locators (EALS), to prevent overestimated working length.Forty extracted human teeth were used for the study. The cervical portion of each canal was flared using Gates Glidden drills and the teeth were embedded in an alginate model. Canals were irrigated with 2.5% sodium hypochlorite. The actual length (AL) and electronic length (EL) measurements were made on each specimen separately with both devices with the aid of a k-type file.The results obtained with each EAL were compared with the corresponding actual length. The statistical analysis of the results showed EAL reliability to prevent overestimated working length to be 100% for the Mini Apex Locator and 97.44% for the Root ZX-II, within a tolerance of ±0.5 mm into account. A paired sample t test showed that there was no statistically significant difference between the accuracy of the devices (P = .5841).The results of this study indicate that the Root ZX-II and Mini Apex Locator are accurate devices to prevent overestimated working length.