Energy Monitors

Multimeters, clamp meters, power meters and energy monitors.

Buying Guides

Per-circuit clamps beat disaggregation, the panel install needs an electrician, and the data should be exportable and ideally local.

Accurate to a watt, a kWh counter that survives unplugging, the right plug and rating, and an app only if you will use it.

A plug-in meter for anything with a plug, a clamp for anything hard-wired, and a day of logging for anything that cycles.

One device at a time, or the whole house by circuit. Different questions, and most homes benefit from both.

Off is rarely off. Remote receivers, clocks, network links and chargers keep drawing watts around the clock.

0.1 kWh per hour, 2.4 kWh per day if it never stops. At a typical tariff, a few cents an hour.