The FTBx-5245/5255 provides improved reliability and accuracy when testing on the field as it provides technicians with all the tools they need. The FTBx-5245/5255 can be housed in the compact and portable FTB-2 or FTB-2-Pro. The module is a portable solution for spectral characterisation of DWDM/CWDM networks, as well as being the industry only all-in-one OSA covering a number of applications. These applications are; high speed (100G+ in-service OSNR, etc.), CWDM, O and L-band testing.