Features:*High-luminance and white LED, features in long life and good stability. *Big LCD to display aboundant contents, and Chinese and English interface are optional. *User-friendly interface to achieve man-machine conversation. *International unit, conventional unit and symbol system are optional. *Monitoring the whole testing process, auto-character and audible-control prompt. *Compatible with 8,10 and 11 items of testing paper. *Free choice to testing paper type produced by different factories. *Data transmission function.