Tektronix TFS3031 The TFS3031 TekRanger Mini-OTDR is

The TFS3031 TekRanger Mini-OTDR is an easy-to-use, mini-optical time domain reflectometer (OTDR) for fiber optic cable installation and maintenance. Designed to withstand the rigors of on-site work, the TekRanger delivers precise measurements on both singlemode and multimode optical fiber networks. And the TekRanger’s patented IntelliTrace™ technology assures quick and accurate fiber link analysis. Easiest to use mini-OTDR True "one-button" fiber analysis Optional singlemode for WAN and multimode for LAN applications Durable; shock-, water-, and dust-resistant