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Find Perfect Solutions in TFN


TFN offers a high-performance multi-function OTDR for fast and accurate optical fiber testing. F4 also features Ethernet test, remote test, OTDR.
| Model / Item | F4 | F4-V1 | F4-V2 | F4-SMV | ||||
| Wavelength(nm) | 1310/1550 | 1310/1550 | 1310/1550 | 850/1300/1310/1550 | ||||
| Dynamic Range(dB) | 35/33 | 42/40 | 45/43 | 26/30/37/35 | ||||
| Event Dead Zone(m) | 1 | 0.8 | 0.8 | 1 | ||||
| Attenuation Dead Zone(m) | 6 | 6 | 6 | 6 | ||||
| Test Range | 500m /1km /2km /4km /8km /16km /32km /64km /128km /256km | |||||||
| Pulse Width | 5ns/10ns/50ns/160ns/320ns/500ns/1000ns/5000ns/10000ns/ 20000ns | |||||||
| Distance Accuracy | ±(0.75m+ sampling interval + 0.005%*test distance) | |||||||
| Optical Connector | FC/PC (interchangeable SC, ST) | |||||||
| OPM | -50dB ~+26dB | |||||||
| Battery | 15600mAh. Standby time over 10 hours | |||||||
| Weight | 1.1 KG | |||||||
Acceptance testing of fiber optic communication systems.
Development and production of fiber optic cables
Construction testing and repair of the communication system.





The OTDR features flexible setup options, including launch and end fiber configurations. It supports customizable PASS/FAIL thresholds, visually distinguishes event qualifications, generates detailed PDF reports, and allows comparison of multiple SOR curves with advanced analysis methods like the four-point and LSA methods.
“Very easy to use. I’ve been a loyal customer of TFN for years. The technical support is nice, and the products are always reliable. it makes troubleshooting much quicker. Great value for the price.”
“I recently purchased an otdr tester, and I couldn’t be excited with my purchase. Compact and fast, it has become our go-to tool for fiber optic testing. The results are very accurate”
Our OTDR support English for standard version, and the optional version supports Russian, Spanish, and Arabic.
For our standard products, if there are in stock and ready for shipment, the lead time is about 7-10 days. For our optional products, the lead time is about 25-30 days.
Yes, we support online training. We also have English operation videos for F7 OTDR (on our YouTube channel) and analysis software for our clients.