Background: Several techniques have been proposed to establish the working length but the ideal technique is yet to be identified. The present study was conducted to compare different electronic apex locators for working length determination. Materials & Methods: 30 freshly extracted single rooted maxillary central incisors were selected. Electronic working length measurement was determined using three apex locators. Group I had Root ZX II, group II had i-Root and group III had elements apex locator. The mean values of actual length and electronic working length readings were compared. Results: The mean actual working length was 22.51 mm. Group I had 22.50 mm, group II had 22.45 mm and group III had 22.72 mm electronic working length. The difference was significant (P< 0.05). Conclusion: Root ZX II apex locators found to be effective in providing electronic working length comparable to actual length.