The 884-SLR OD3 Attenuator is a stackable OD3 attenuator that can
be mounted to an 818-SL series detector to attenuate the input
beam. It is the RoHS compliant version of obsolete 883-SL and
884-SL. The clear aperture is 10.3 mm. Note that one attenuator is
already included and calibrated in the 818-SL/DB detector. If you
already own an 818-SL series detector and want to have the
attenuator calibrated together with the detector, you must contact
Newport service department.