"Bob Phillips" wrote...
=SUMPRODUCT(--(ISNUMBER(FIND("Station 1",SWABS!F7:F237))),
--(ISNUMBER(FIND("F",,SWABS!L7:L237))))
....

Note the ,, typo.

Or use just one ISNUMBER call.

=SUMPRODUCT(--ISNUMBER(FIND("Station 1",SWABS!F7:F237)
+FIND("F",SWABS!L7:L237)))

or, if the OP could suffer an array formula,

=COUNT(FIND("Station 1",SWABS!F7:F237)+FIND("F",SWABS!L7:L237))

No magic in using +. - * / would work equally well. ^ might overflow.