The features of ROOT-PI（III） Apex Locater: 1．The measurement is free from the root canal environment. Therefore, this instrument can provide accurate measurements of the root canal length in dry condition or in the presence of sodium hypochlorite, hydrogen peroxide, saliva, blood or pulp. 2. The measurement is free from the thickness of the file. 3. The LCD screen legibly and visually displays the depth of the root-canal file putting into the tooth. The whole root-canal is divided into 15 squares on the screen. 4. When in the process of measuring, the changes of the sound can indicate the position of the file in the root-canal. 5. The narrow area of the root-canal can be adjusted by the dentists if necessary. 6. This power of the machine is supplied with NO. 7 dry battery. For the depletion of electricity power is slim, the meter can be used for long. 7. The accessories of the instrument can be disinfected under high pressure to avoid cross infection between the patients. MAIN TECHNICAL INDEX 1. Power voltage: DC7.5V 2. Power consumption: below 0.04w 3. Current: <10礎 4. Voltage: <80mv.AC 5. Display mode: color LCD screen and piezoelectric buzzer 6. Feature: 110?20?0mm 7. Weight: about 600g 8. guarantee time: two years