The Woodpex III apex locator utilizes multi-frequency apical position technology, enabling accurate measurements even in the presence of blood or residual pulp in the root canal. Its upgraded chip offers real-time response, doubling sensitivity and enhancing accuracy with an innovative algorithm, multi-frequency measurement, and anti-interference features. Unlike traditional methods where dentists rely on hand sensation and patient feedback, which is subjective and yields low accuracy, studies indicate that the handling method has an accuracy rate of only 42%, with a range of error of ±0.5 mm, regardless of tooth type.