Root ZX II measures root canals accurately and precisely. It will measure in wet or dry canal conditions with class-leading accuracy of 97.5%. The ratio technique used in the instrument provides a highly accurate detection of the file's location. Type: Long File Holder. Increases access to work area. Used for easy apex reading. Ideal for hard-to-reach areas. Root ZX File Holders work with the Root ZX II Apex Locator to increase access to the work area. Each file holder is autoclavable and measures 5 inches, and has a fork-like tip that enables apex reading, even in limited access molar procedures.