Liquid Meter Proving


Watco-owned Main Line Measurement offers on-site tank and pipeline meter proving for all types of volumetric and mass flowmeters, including coriolis, positive displacement, turbine, and ultrasonic. Measurement technicians are equipped with state-of-the-art provers and other associated testing equipment that is fully portable to ensure timely service and accurate measurement.


We offer small volume, pipe, and tank provers, operating at rates from 5 Bbl/hr to 13,000 Bbl/hr.


  • Crude oil
  • Various NGLs
  • Gasoline
  • Diesel



  • On-site meter proving
  • On-site meter calibration and equipment repair
  • On-site liquid measurement consulting
  • Measurement training and education
  • Meter and measurement equipment sales
  • Meter prover repair and sales
  • Water draw calibration

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