TOMO -70 to +10dBm TL510 Portable Optical Power Meter with SC and FC Connector Fiber Tester, Batteries Included High sensitivity, big dynamic range; Larger screen and LED backlit; Batteries are Included Common interface design: FC/SC/ST interface, with standard FC, SC adapter interface Miniature chassis protection design, compact and easy, prevent accident drop damage instrument detectors Rapid response, no preheating; Low voltage function display; New user auto-calibration function; Logarithm power (dBm) and linear power (xW) measurement The automatic shutdown function can be chosen; Automatically shut off the backlight function can be chosen