Hi Dan,
Try something like:
'=============>>
Public Sub Tester()
Dim SH As Worksheet
Dim Rng As Range
Dim Rng2 As Range
Const sStr As String = "ABC"
Set SH = ActiveSheet
With SH
Set Rng = .Range("A1")
Set Rng2 = .Range("A1:A10")
End With
MsgBox InStr(1, Rng.Value, sStr, vbTextCompare) > 0
MsgBox Application.CountIf(Rng2, sStr) > 0
End Sub
'<<=============