This pack includes 1 additional sensor for the efergy e2 or Elite energy meter.
By purchasing 2 of these extra sensors, you can monitor 3 phase power usage.
A total of 3 sensors are required to measure 3 phase power: 2x additional sensors, plus the 1x sensor included with the efergy e2.
Note, these extra sensors are optional accessories for the Efergy e2 Wireless Smart Electricity Meter
or Efergy Elite
sold separately (1 sensor is included with the Meter).
(This sensor is not
compatible with the original efergy e.one)