(a) Test standards must be certified annually by a recognized or accredited laboratory that adheres to ISO 17025 standards. A service company must maintain at least one test standard per licensed device category as follows:
  (1) Low flow: five-gallon or greater test measure or prover;
  (2) High flow: prover with a capacity that exceeds the amount of liquid delivered by the device in one minute at the maximum flow rate.
(b) A test standard that becomes damaged must be taken out of operation immediately and recalibrated prior to use. A test standard that is beyond repair must be taken out of service permanently.
(c) A service company must maintain the minimum test standards per licensed device category at all times.

Source Note: The provisions of this §97.58 adopted to be effective September 1, 2020, 45 TexReg 6082; amended to be effective March 1, 2022, 47 TexReg 911