Tex. R. Civ. P. 171
The court may, in exceptional cases, for good cause appoint a master in chancery, who shall be a citizen of this State, and not an attorney for either party to the action, nor related to either party, who shall perform all of the duties required of him by the court, and shall be under orders of the court, and have such power as the master of chancery has in a court of equity.
The order of references to the master may specify or limit his powers, and may direct him to report only upon particular issues, or to do or perform particular acts, or to receive and report evidence only and may fix the time and place for beginning and closing the hearings, and for the filing of the master's report. Subject to the limitations and specifications stated in the order, the master has and shall exercise the power to regulate all proceedings in every hearing before him and to do all acts and take all measures necessary or proper for the efficient performance of his duties under the order. He may require the production before him of evidence upon all matters embraced in the reference, including the production of books, papers, vouchers, documents and other writings applicable thereto. He may rule upon the admissibility of evidence, unless otherwise directed by the order of reference and has the authority to put witnesses on oath, and may, himself, examine them, and may call the parties to the action and examine them upon oath. When a party so requests, the master shall make a record of the evidence offered and excluded in the same manner as provided for a court sitting in the trial of a case.
The clerk of the court shall forthwith furnish the master with a copy of the order of reference.
The parties may procure the attendance of witnesses before the master by the issuance and service of process as provided by law and these rules.
The court may confirm, modify, correct, reject, reverse or recommit the report, after it is filed, as the court may deem proper and necessary in the particular circumstances of the case. The court shall award reasonable compensation to such master to be taxed as costs of suit.
Tex. R. Civ. P. 171