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https://www.grandwaytelecom.com/En/Index/pageView/catid/116/id/1399.html
Functions
Grandway ofi 3 optical fiber identifier is a low cost, portable instrument designed to detect optical signals without disrupting online service. During installation and maintenance of optical network, it's often necessary to isolate a specific fiber, By simply clamping the OFI-3 on a fiber. The OFI-3 will indicate if there is a signal, the direction, the intensity and the modulation frequency.

900~1650nm
Wavelength range

270/1k/2kHz
Frequency

Min -50dBm
Sensitivity

5 grades
Intensity

2*AA dry
Battery

Features
Convenient and easy to use
LED indicator is simple and clear
Identification of 270/1k/2kHz modulation frequency
Direction and intensity indication of optical signal
Natural light intensity calibration function

If you want to get more details of otdr in telecom, please visit our website.