Description: The features are as follows: a. The measurement is free from the root canal environment. Therefore, whether the root canal is dry, or filled with electrolyte, blood or physiological brine will not affect the measuring result. b. The measurement is not affected by thickness of the file. c. The LCD screen visually displays the moving trace of file in the root canal. d. There is beep alarm to indicate the apex when the display number on the LCD is below 2mm e. The power of the unit is supplied with 5 pieces of AAA dry Li-on battery. f. File holder & hooks can be autoclavable! CE Mark 10G