Guangzhou WANGLU communication co., ltd was established in 2003. It is a high-technology corporation which specializes in the development, production, application, sale and technical service of the products about the testing meter, data communication and optical transmission. Now, aiming at the installation and maintenance of CCTV monitoring project, we develop the newest CCTV security tester--STest-891, which is easy to carry and use. The work efficiency can be obviously improved by using this kind of tester, so it is the necessary testing tool for the project merchant. Welcome ***** i c k e y l e e @ 2 1 c n . c o m