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GrandLink GLK3500 OTDR is a flexible tool that can be used for PON network testing, CATV network testing, LAN network testing, and FTTX testing. TheGrandlinkoptical fiber tester features a 3.5-inch LCD with toughened glass screen. The Optical Time-Domain Flowmeter (OTDR) 1310nm/1550nm, 26dB/24dB, and RJ45 can only test tracker and line length.