We use large and bulky equipment for testing (ExFo) and characterization. I bought this OTDR for preliminary weld testing and basic troubleshooting. Since we have high throughput and a large number of fibers (576), this setup works great. We recently had to find an appointment for a client and the entries from ExFo and SpeedWolf matched perfectly. Best of all, it's small, light, and has great battery life. Also, Notes' prompt customer service is outstanding even after months of ownership!