Choosing a power meter for energy management starts with one question: do you need a simple plug-in monitor for a single appliance, or a panel-level and three-phase system that tracks power quality? The four options here span from $17.99 to $506, so matching the meter to your panel, phase, and app ecosystem matters as much as price.
Quick Take
The SONOFF LCD Smart Power Meter Switch at USD 17.99 is the lowest listed price in the group and puts real-time readings on an on-device LCD. The SONOFF POWCT at USD 34.99 adds a split current transformer and works with Alexa/Google Home. The Tuya WiFi Three Phase Power Meter at USD 197.95 is the one to consider for three-phase circuits with bi-directional measurement and leakage protection, though a circuit breaker and shunt trip device are required for those protection features. The General Electric PQM II at USD 506.00 is a used three-phase power quality meter listed as TESTED and described as powered on and working.
Listed Price Comparison
| Product | Listed Price | Relative price bar | Headline feature |
|---|---|---|---|
| SONOFF LCD Smart Power Meter Switch 20A Max Power Monitoring Overload Protection | USD 17.99 | On-device LCD, 20A max, overload protection | |
| SONOFF POWCT Smart Power Meter Switch Energy Monitor Work with Alexa/Google Home | USD 34.99 | Split CT up to 100A, Alexa/Google Home, eWelink | |
| Tuya WiFi Three Phase Power Meter Smart Bi-Directional CT Clamps Voltage Leakage | USD 197.95 | Three phase, bi-directional, leakage protection | |
| General Electric PQM II Power Quality Meter for 3 Phase System - TESTED | USD 506.00 | Used GE PQM II for three-phase systems |
Decision Matrix
| Your situation | Consider | Listed Price | Why |
|---|---|---|---|
| A single-device monitor with an on-unit LCD and 20A limit | SONOFF LCD Smart Power Meter Switch | USD 17.99 | It shows real-time power, voltage, current, and cumulative energy use on the LCD and includes overload protection. |
| Split CT installation plus voice assistant control | SONOFF POWCT | USD 34.99 | The split CT design is meant for indoor circuit panel use and works with Alexa/Google Home and eWelink. |
| Three-phase monitoring with bidirectional measurement and leakage protection | Tuya WiFi Three Phase Power Meter | USD 197.95 | It supports kWh tracking, over/under voltage/current, leakage monitoring, and works with the Tuya Smart Life app. |
| A three-phase power quality meter from GE, used condition | General Electric PQM II Power Quality Meter | USD 506.00 | The GE PQM II is marketed for three-phase system power quality measurement and is listed as TESTED. |
Product Notes
SONOFF LCD Smart Power Meter Switch 20A Max Power Monitoring Overload Protection
This is the lowest listed price in the group. Its clear LCD makes it easy to glance at real-time power, voltage, current, and cumulative energy consumption without opening an app. The title points to 20A max power monitoring and overload protection, so it fits a single circuit at home rather than whole-panel or three-phase work. It connects via Wi-Fi, has a white PC V0 casing, and is listed as new. One clear limitation is the 20A ceiling: you cannot monitor a large feeder or split-phase load with this unit. If your goal is a compact, low-cost look at one appliance or circuit, this is the no-frills route.
SONOFF POWCT Smart Power Meter Switch Energy Monitor Work with Alexa/Google Home
The POWCT is a Wi-Fi energy monitor with a split current transformer, so it is designed for indoor installation inside an electrical circuit panel rather than inline with an appliance. The title confirms Alexa and Google Home integration, and it works with the eWelink APP. The CT can handle up to 100 A for monitoring power consumption of household appliances or rooms. Its casing is PC and the color is white, and the applicable place is listed as indoor. A notable limitation is that the split CT approach favors circuits where the current transformer can be clipped around a conductor; it is not an all-in-one inline switch for a single plug. If you want voice control and current monitoring across more than one appliance, this is the middle listing.
Tuya WiFi Three Phase Power Meter Smart Bi-Directional CT Clamps Voltage Leakage
This is the most feature-heavy new meter here for three-phase systems. It tracks kWh, measures bidirectionally, includes three CT clamps, and offers threshold alerts for over-voltage, under-voltage, over-current, under-current, leakage, temperature, and phase imbalance. Remote monitoring and device sharing go through the Tuya Smart Life app, and voice commands are supported. Its listed accuracy class is ±1%. A key limitation: a circuit breaker and shunt trip device are required for the protection functions to operate, so it is not a standalone safety device. Use it where three-phase monitoring and adjustable thresholds are more important than plug-and-play simplicity.
General Electric PQM II Power Quality Meter for 3 Phase System - TESTED
The GE PQM II is a used power quality meter for three-phase systems, listed at the highest price in this comparison. The title includes TESTED, and the unit is described as powered on and working, with a note that some buttons do not make a clicking sound. That means you are buying a working unit with a specific cosmetic/mechanical caveat. The listed focus is three-phase power quality measurement. If your priority is a GE-branded three-phase meter for the panel, this used unit may be the right fit. The condition is explicitly used, so set expectations around button feel.
Final Recommendation by Use Case
- For a single 20A circuit at the lowest listed price, the SONOFF LCD Smart Power Meter Switch is the straightforward option.
- For voice control and split CT installation in a home panel, the SONOFF POWCT is the stronger fit.
- For three-phase monitoring with bidirectional measurement and leakage protection, the Tuya WiFi Three Phase Power Meter covers the most ground.
- For a used three-phase power quality meter with a GE nameplate, the General Electric PQM II is the dedicated choice.
