The AFL ST Adapter Cap 2900-50-0004MR is for use with the Handheld OTDRs and OLS series light sources. Both multimode and single mode test ports are equipped with tool-free, switchable adapter mounts. Test Port Adapter Cap allows OTDRs and light sources to interface launch cables with a variety of connector styles. Compatible with C850, C860, M200, M650, M700, OFL-250 & OFL280 OTDRs as well as OLS1-Dual, OLS2-Dual, OLS4 and OLS7 series light sources.