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just behind the trigger source selection switch. | just behind the trigger source selection switch. | ||
A rack-mount version, the RM556 also exists. | A rack-mount version, the RM556 also exists. | ||
The 556 superficially resembles the [[565]], | |||
which is is also a dual-beam one-piece scope, but the 565 takes two | |||
[[2-series or 3-series vertical plug-ins]] | |||
and has much lower vertical and trigger bandwidth. | |||
<gallery> | <gallery> |