The Precision property is normally read-only on a Field object, but for new Field objects that have been added to the Fields collection of a Record, it is read/write after the Value property for the Field has been specified and the provider has successfully added the new Field by calling the Update method of the Fields collection

objectname.Precision

<%
set conn=Server.CreateObject("ADODB.Connection")
conn.Provider="Microsoft.Jet.OLEDB.4.0"
conn.Open "c:/webdata/northwind.mdb"

set rs = Server.CreateObject("ADODB.Recordset")
rs.open "Select * from orders", conn

response.write(rs.Fields(0).Precision)

rs.Close
conn.close
%>