The right power meter for energy management depends on where you plan to use it. This comparison covers four products at very different price points: a $17.99 SONOFF unit, a $34.99 SONOFF unit, a $197.95 Tuya unit, and a $1,199.99 Fluke unit. To make a smart choice, you need to know what each one is designed to do.
Quick Take
All four products are power meters, but they are built for different situations. The two SONOFF units are home-oriented, the Tuya unit is for a more complex electrical setup, and the Fluke unit is a specialist tool. Use the decision matrix below to match your actual use case.
Listed Prices at a Glance
| Product | Listed Price | Price Bar |
|---|---|---|
| Tuya WiFi Three Phase Power Meter Smart Bi-Directional CT Clamps Voltage Leakage | USD 197.95 | |
| SONOFF POWCT Smart Power Meter Switch Energy Monitor Work with Alexa/Google Home | USD 34.99 | |
| SONOFF LCD Smart Power Meter Switch 20A Max Power Monitoring Overload Protection | USD 17.99 | |
| Fluke 345 Single Phase Power Quality Clamp Meter DC Current 2000A | USD 1,199.99 |
The bars show the relative position of each listed price. The Fluke 345 sits well above the rest, while the two SONOFF meters are the least expensive picks and the Tuya meter lands in the middle.
How to Decide
| Your Priority | Recommended Product |
|---|---|
| A visible display and overload protection for a single circuit | SONOFF LCD Smart Power Meter Switch 20A Max Power Monitoring Overload Protection |
| App-based control and voice assistant support | SONOFF POWCT Smart Power Meter Switch Energy Monitor Work with Alexa/Google Home |
| Three-phase monitoring with CT clamps | Tuya WiFi Three Phase Power Meter Smart Bi-Directional CT Clamps Voltage Leakage |
| High-current DC clamping | Fluke 345 Single Phase Power Quality Clamp Meter DC Current 2000A |
Product Notes
Tuya WiFi Three Phase Power Meter Smart Bi-Directional CT Clamps Voltage Leakage
This meter is built for a three-phase setup and comes with CT clamps for measuring energy in both directions. The product description points to adjustable thresholds for voltage, current, leakage, temperature, and phase imbalance, plus remote monitoring and device sharing through the TUYA Smart Life app. The ±1% accuracy class is a concrete spec for someone who needs a number to trust. The limitation is that it needs a circuit breaker and shunt trip device for the protection functions to work, which adds to the setup requirements. Choose it when your electrical plan involves three-phase, bi-directional metering and you want WiFi access to the readings.
SONOFF POWCT Smart Power Meter Switch Energy Monitor Work with Alexa/Google Home
This SONOFF meter is a Wi-Fi-connected switch that uses a split-core current transformer, according to the product description, so it's aimed at home energy monitoring without direct contact with live wires. It supports Alexa and Google Home, and it works through the eWeLink app. The transformer current detection goes up to 100 A, which covers most household circuits. The limitation is that it's designed for indoor use, so it's not meant for outdoor installations. Pick this if you want to monitor a large portion of your home's electrical panel and control it with voice commands through your smart assistant.
SONOFF LCD Smart Power Meter Switch 20A Max Power Monitoring Overload Protection
This is the least expensive option in the group, but it still gives you a clear LCD display for real-time power, voltage, current, and cumulative energy use, as noted in the product description. The 20A max power monitoring and overload protection words in the title make it best for a single appliance or a branch circuit that stays under 20A. It connects over Wi-Fi and is listed as compatible with a universal range of hardware, so it doesn't lock you into a specific ecosystem. The limitation is that 20A is a modest ceiling compared with the 100A rating on the SONOFF POWCT or the 2000A capability of the Fluke 345. For a simple, visual energy monitor that won't cost much, this one is a straightforward choice.
Fluke 345 Single Phase Power Quality Clamp Meter DC Current 2000A
The Fluke 345 is the only clamp meter in this lineup and the only one with a DC current measurement of 2000A. It's listed as a used single-phase unit, so it's really a power quality tool rather than a home energy management device. The clamp feature lets you take readings without disconnecting wires, and the 2000A range means it can handle high-current work. The limitation is the much larger price tag and the single-phase configuration, which won't directly cover a three-phase system the way the Tuya meter can. If you need a portable, high-current DC clamp meter for testing, this is the product that fits that role.
Final Recommendation by Use Case
Match your situation to the decision matrix above. The SONOFF LCD fits a single-circuit task. The SONOFF POWCT is the one to choose for a connected home. The Tuya meter is for a larger electrical network. The Fluke 345 is for on-site electrical testing. Choose the product whose row matches the scale of work you're doing.
