USB C cable tester - C2C caberQU from The current stuff on Tindie
Handheld Optical Power Meter with 5km Red Light -70~+6dBm Mini Optical Power Tester Network Cable Tester Portable Digital Light Power Meter with 7 Optional Optic Wavelength - Walmart.com
Klein Tools TDR Cable Length Meter 501-915 - The Home Depot
Klein Tools 501-915 Cable Tester, TDR Cable Length Meter Measures Electrical, Data, Two-Wire and Romex Cables, Includes Leads, Carrying Case - Amazon.com
ELEGIANT RJ11 RJ45 Cable Tester Line Finder Multifunction Wire Tracker