The CWDM ChannelChecker from Viavi (formerly JDSU) can also be used in the FTTx area for troubleshooting.
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Smart Optical CWDM Channel Checker
JDSU's Smart optical handhelds go beyond the basics
The JDSU OCC-55 is a handheld, battery-operated CWDM Channel Checker that is ideal for field service groups tasked with the installation, maintenance, and upgrades of CWDM systems. The OCC-55 scans the CWDM system and automatically records all channels with the wavelength and the related power level. The information can be displayed in a graphical spectrum format, or in a table of results so that users can easily check the performance of each and every channel.