Fluke power quality meters. They are specifically designed for this purpose and can test single phase, multi-phase, and split phase configurations. Then you need to record data and observe it over a given duration. With some simple math, you can estimate your long term energy usage. This method can be a bit tedious, especially for commercial facilities. However there are many devices available in the market that can solve this problem. These are called power loggers and they automatically record and analyze data. Although this method will take time, it is very accurate and you will get complete details about your power consumption.
With the developing technology, power quality meters have also diversified. You can get anything from an entry level basic power measuring meter to automatic meter that can do everything from recording to analyzing. Depending upon your requirements and your budget, you can decide which one best suits your needs. We stock all power quality meters, loggers and analyzers from all major manufacturers. You can easily buy, rent, or lease electrical test equipment from us.