You need to use a Power Quality Analyser such as the Sonel PQM-702 or Fluke 435, a Power Quality Meter like the Sonel PQM-700 or a Power Energy Logger such as the Chauvin Arnoux PEL103.  However, we support most of the major manufacturer’s test equipment so if you already have a meter please contact us and we can advise on its compatibility with our service.