if [QCI_SpecialCalcInd] is Number, use this
strSQl = "UPDATE tblQuoteCostingItem SET [QCI_meterage] = " & strMeters & " WHERE [QCI_SpecialCalcInd]=" & strSpecialCalcInd
if [QCI_SpecialCalcInd] is Text, use this
strSQl = "UPDATE tblQuoteCostingItem SET [QCI_meterage] = " & strMeters & " WHERE [QCI_SpecialCalcInd]='" & strSpecialCalcInd & "'"