In Connecticut you can limit your liability by agreement  to a reasonable amount, but you cannot exculpate (escape) yourself from liability entirely. Generally, this would require an agreement up front by the parties prior to or at the time services are ordered by the client. It is questionable as to whether it could be imposed after services are rendered as a statement on an invoice or an abstract.

Arguments could be made that there is an implied acceptance of the limitation clause by the client if the client has paid for the services, but this is an up hill battle. In return the client could argue that the limitation clause was nothing more than an attempt to unilatterally modify an agreement that did not previously contain the clause. If you wish to limit liability the best method is to draft it into a written agreement rather than to announce it on an invoice or abstract. However, it is unlikely that clients are going to be receptive to the contract when it is so easy to find abstractors that will perform the work without question.