In view of the different test requirements, we r&d and manufacture multiple types of optical power meter. They have many advantages include a deft appearance, friendly user page, wide test range, accurate testing accuracy and brand-new auto-calibration function etc. In addition, FG510 adopt FC/SC/ST interchangeable connector design, it makes test without complex conversion. FG511 adds up some new functions such as USB communication, data storage, wavelength and frequency automatic identification and others. It would be the best choice of the installation, engineering acceptance and maintenance of fiber network.