JONARD Tools Optical Fibre Identifier OFI-50Quickly identify the direction of transmitted fibre and display the relative core power without disconnecting the fibre. This fibre identifier also features the following: Easy to use one key operation Efficiently identifies the traffic direction and frequency tone (270Hz, 1KHz, 2KHz) with an audible warning. The display shows you the relative core power clearly Includes a 3 mm, 2 mm, 900 nm (0. 90 mm) and 250 nm (0. 25 mm) adapters for different