Root ZX mini
| Manufacturer | J. Morita |
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| Technology | Ratio method (dual-frequency impedance) |
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| Power | Rechargeable, portable |
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| Notable | Widely regarded as the reference standard since the 1990s |
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The Root ZX (and its compact successor, Root ZX mini) is a dual-frequency apex locator from J. Morita. It has served as the reference instrument in most apex-locator comparison studies for over two decades. The ratio method analyzes the impedance ratio at two frequencies, providing reliable readings in the presence of NaOCl, blood, or pulp tissue.
- Place the lip clip and file clip, advance the file passively until the display reads "APEX" (0.5) — this is the apical constriction, approximately 0.5–1.0 mm short of the radiographic apex.
- Works well through most electrolytes; dry canals may read inaccurately.
- Periapical lesions do not affect accuracy.
- Pairs well with any motor; some later models integrate with torque control.
- File clips: J. Morita replacement file clips (proprietary)
- Lip clips: J. Morita replacement lip clips
- Integrates with: J. Morita TriAuto ZX2 (combined motor + apex locator)