1.Better than 1% accuracy
2. 0.2% of repeatability
3. 4¡Á16 English letters LCD display
4. Operate with clamp on transducers
5 RS 232 interface or 1-channel isolated OCT output
6. Pipe diameters from 15mm to 6000mm
7. Ni-MH battery operation of over 12 h
8.90~230VAC power supply
9. Internal data logger
10. Bilingual interface in Chinese and English