Optical Power Meter, SainSonic WattsOut OP-600, Portable Optical Power Meter, -50 - +26 dBm, SC/FC/ ST Interfaces, Fiber TL510C for CATV Test, CCTV Test and Telecommunication High sensitivity and high precision- it responses very quickly without preheating and can display fast-tracking and real-time measurement when output power changes, with a high accuracy Versatile interface design- the interface is applicable designed for SC, FC, ST connections and standard universal 2.5mm adaptors, making it more suitable for ftth Practical and compact design- Miniature chassis protection design prevents damage caused by accident drop; it is portable and easy to bring with large screen and LED backlight User-friendly functions- the automatic shutdown function can be chosen; low voltage function display notifies you the battery is low; The user auto-calibration function will help the new users to adjust the measurement