J-Deal TL510A Hand-held Optical Power Meter + TL532 Visual Fault Locator Fiber Optic Cable Tester Meter for Telecommunications Engineering Maintenance Cabling System (TL510A + TL532 1mw) Type A: Measurement range: -70~+10 dBm; High measurement accutracy and display resolution Common interface design: FC/SC/ST interface, with standard FC, SC adapter interface Auto-off function; Backlight LCD display; AAA batteries which is more convenient to carry; Small size, easy to field test. High quality pen type visual fault locator Functions: Finding the breakpoints, poor connections, bending or cracking in fiber optic cables