Colon
The colon follows a complete sentence. It is used to indicate a break in continuity that is greater than a semicolon but less than a period. It may be used to emphasize a sequence in thought between clauses or to separate one clause from a second that illustrates or amplifies the first.
Wafer monitors were typically not used during production implants: the in situ monitors were employed to get a better picture of particle behavior.
The colon is placed outside quotation marks or parentheses.