Enables the Root ZX II Apex Locator to function as a low-speed handpiece and an apex locator. It snaps easily onto the back of the Root ZX II, and measures and prepares the canal with a unique 90° autotorque release-and-file advancement feature. OTR maintains excellent cutting efficiency with less stress on the file, reducing the possibility of breakage. It offers 3 speed settings of 100, 300, and 500 rpm and 3 programmable memory modes. In ‘‘normal’’ mode, 8 speed settings—from 150–800 rpm—and 11 torque settings are available. 1-year warranty.