Fangrui Product Details Features: 1. Multifuction Network Cable Tester + Multimeter + Optical Power Meter +10w Vistal Fault Locator 4 In 1 2. Ethernet, Telephone And Coaxial Video Cable Length Measurement,up To 600 Meters 3. Powerful Network Cable Analysis Function: Open Circuit, Short Circuit, Crossover And Crystal Head Crimping Test 4. Professional Multi-function Multimeter, Display Up To 60,000 Digits (only For Et638) 5. 6dbm To -70dbm Optical Power Meter Design, Compatible With , Sc, Fc Interfaces 6. Equipped With Red Laser Emission Function, The Optical Fiber Transmission Distance Can Reach 10km, For Visual Positioning Of Breakpoints 7. Scan(line Finding ),is Noise-free And Anti-interference, Quickly Find The Target Line In Complex Lines, Support Rj45 Bnc Cable 8. Innovative Engineering Accounting Function, Which Can Retain Up To 100 Length Records And Calculate Network Costs 9. Support Chinese, English, German, Spanish Display, More In Line With User Needs 10. Both The Host And Finder Are Powered By Rechargeable Lithium