When you're comparing power meters for energy management, the first question is usually where you're measuring: a home electrical panel or a three-phase industrial system. The SONOFF POWCT and the General Electric PQM II sit at opposite ends of that choice, and their price difference makes the decision even more consequential. One is a new smart switch that reads consumption; the other is a used industrial instrument that assesses power quality.
Quick Verdict
If you need to monitor household energy use and control circuits with Alexa or Google Home, the SONOFF POWCT is the clear pick. If you need a three-phase power quality meter for industrial or commercial electrical work, the General Electric PQM II is the more appropriate tool. The SONOFF costs $34.99, while the GE costs $506.00.
Comparison Table
| Feature | GE PQM II | SONOFF POWCT |
|---|---|---|
| Listed price | $506.00 | $34.99 |
| Condition | Used | New |
| Best for | Three-phase power quality | Home energy monitoring and smart switching |
These two meters serve very different users. One is at home in a factory or commercial building; the other is at home in a residential electrical panel. Your decision should be driven by the system you need to monitor.
Where Each Product Wins
- GE PQM II is the right direction when you're dealing with a three-phase system and need to assess power quality. It's a used unit designed for that setup. Its focus is measurement rather than home automation, which makes it a better fit for facilities and commercial sites.
- SONOFF POWCT is the right direction for home energy management. It works with Alexa and Google Home, connects over Wi-Fi, and uses a split CT sensor to measure current up to 100 A without direct contact with live wires. For a residential panel, that sensor approach simplifies installation and keeps live parts off your hands.
Product Notes
General Electric PQM II Power Quality Meter
The GE PQM II is a used power quality meter built for three-phase systems. If your goal is to monitor power quality in an industrial or commercial electrical network, this instrument is designed for that job. It has been powered and inspected, and some buttons do not have a clean clicking feel. That's a normal consideration when buying used industrial test equipment. Choose the PQM II when you need three-phase power quality measurement and you're comfortable with a pre-owned unit. Its role is professional electrical measurement, so it's less about daily smart home convenience and more about getting a specific job done. For anyone working in a facility with three-phase distribution, this meter turns a vague power quality question into a measurable reading.
SONOFF POWCT Smart Power Meter Switch
The SONOFF POWCT is a new smart power meter switch that works with Alexa and Google Home. Its split CT sensor measures current up to 100 A, and it's meant for indoor installation in a home electrical panel. If you want to track the energy use of individual rooms or appliances and control them through your smart speaker, this is a straightforward fit. The trade-off is that this is a residential energy monitoring tool, not a three-phase power quality instrument. For a home energy management setup, the POWCT offers the smart integration and split-core sensing that make it easy to add to an existing panel without rewiring around live wires. It also gives you a way to see what's drawing power in each monitored circuit, which is the core reason most people add a monitor like this in the first place.
Final Choice by Use Case
If you're setting up home energy management and want voice control, go with the SONOFF POWCT. If you're working on a three-phase industrial system and need a power quality meter, the GE PQM II is the one to buy.
