I have been testing three of these devices, the Power Monitor from Black & Decker Corp. (BDK), the very similar PowerCost Monitor from Blue Line Innovations Inc., and the more-sophisticated The Energy Detective 5000 from Energy Inc. In my tests, the Black & Decker model provided the most effortless electricity-tracking service. At $99.99, it is also the least expensive.

The devices provide real-time data about how much power you’re using across the house in terms that are easy to comprehend: cost per hour and cost per month. Turn on the microwave and watch the cost jump from 10 cents to 25 cents an hour. Turn off some lights and see the cost drop a few cents.

The firms say their customers have, over time, seen drops of as much as 20% in power bills by being more mindful of electricity use and making informed purchases. An independent Oxford University study in 2006 found that people getting direct feedback on their power consumption reduced use 5% to 15%.

After I began monitoring, my most-recent electricity bill dropped $10 from the month before—but that could also be due to my living in a city where air conditioning isn’t a summer necessity. I find myself thinking more about electricity, and even running back into the house to make sure the lights are out.

The monitors sold by Blue Line and Black & Decker are almost identical, because they’re both manufactured by Canada-based Blue Line. The Blue Line model costs $109, is a bit larger, and features a slightly longer range for the wireless signal that transmits power use from your electric meter.

Connecting these two devices to my electric meter was simple. First, loop a metal belt around the glass dome covering the meter. Then align a sensor attached to the belt on top of the glass to read the data collected by your meter. On my old-style meter, the Power Monitor’s sensor keeps track of how fast a dial rotates. The companies say their products work with about 90% of meters in North America.

The sensor you attach to the electric meter wirelessly sends raw data to a digital monitor that is kept inside the house. Before using the monitor, you have to enter data from your electric bill, but finding the right data can be tricky. Black & Decker’s instructions on this are relatively clear, and entering the data into the digital monitor involves a process similar to setting an alarm clock.

The digital monitors, about the size of a large remote control, can sit in one room or travel about the house. A button labeled “tare” on the Black & Decker model helps you calculate how much electricity is being used by any single appliance that you can turn off and on.

The Black & Decker model features a rudimentary display that only reports the aggregate power use for your house at any given time. It can’t go back and show you changes over time.

But the latest model from The Energy Detective, known as TED, connects directly to a house’s power supply for a more-precise read than the Black & Decker. It comes with software that graphs how use patterns change over time. The TED 5000 costs $199.

But installing TED requires turning off your home’s main power line and inserting a sensor into your circuit breaker—a process that the company says should be done “by qualified personnel only.” I sought help from a friend who has a lot of wiring experience, but after several hours, we were unable to make TED work. My issue was likely a decades-old circuit breaker. The company said my configuration is atypical and that problems like this are rare. A colleague has been using TED for several weeks after hiring an electrician to install it.

While TED 5000 offers many more advanced tools for sleuthing your home’s electricity waste than the other models, all of its sophistication won’t necessarily help the average user do much of a better job remembering to turn off the lights. For most of us, the large cost-an-hour sign on the Black & Decker Power Monitor offers the only feedback we really need.

And before buying any of these devices, keep in mind that many utility companies are installing a new generation of so-called “smart” meters, which not only measure real-time power use, but also offer two-way communication with the power company to help cut costs. And Google Inc.’s (GOOG) nonprofit foundation is working with power companies on a free service that connects data about your power use into an online widget.

Walt Mossberg is on vacation. Email Geoffrey A. Fowler at geoffrey.fowler@wsj.com

Now, Wi-Fi is making its way into your car. A small California company, Autonet Mobile, has teamed up with Chrysler and others to sell a service that floods any brand or model of car or truck with Wi-Fi Internet connectivity that can be used by multiple passengers and devices simultaneously. It’s a dealer-installed option on Chrysler vehicles, but Chrysler dealers, and some independent auto electronic shops, will install it on any brand of car for a fee.

The system works via a special wireless router, mounted in the trunk or rear cargo area, that draws Internet connectivity from cellphone towers and then converts it into an in-car Wi-Fi signal with a range of 100 feet. This router looks like a military device, because it is ruggedized to survive jolts and vibrations, and is shielded to avoid interference with the car’s electronics or with cellphone calls.

As long as they have built-in Wi-Fi, the laptops and smart phones used in the car don’t need any add-on hardware or software to use Autonet. To them, it looks like any other Wi-Fi signal. And no special car antenna is needed; the router uses its own large antennas.

I’ve been testing Autonet Mobile in a rented Saturn Vue SUV in Washington, D.C., and its suburbs, and found it worked well for most basic Internet tasks like email and Web surfing. The router turns on when the car does, and the Wi-Fi signal shows up about 30 seconds later. However, Autonet is relatively pokey. It’s too slow to be reliable for streaming video longer than brief YouTube clips, or for smooth video chatting.

Perhaps the biggest downside of in-car Wi-Fi is that it provides one more potential distraction for drivers. The company says the service is only for passengers, not drivers, but there’s no technical barrier to a driver using it.

The Autonet Mobile router

Of course, drivers already can court danger this way by using cellphone wireless connectivity on a laptop, iPhone, BlackBerry or other connected device. And that raises another question: Since you can already connect to the Internet from a car with a smart phone or a cellular data card for a laptop, why would you want Autonet?

There are three reasons. First, cellular Internet access is typically tied to a single device at a time. But Autonet’s Wi-Fi service works just like Wi-Fi in your house: Multiple people with multiple devices can use it at the same time. In fact, the company envisions that the service’s primary use will be to allow children in the back seat to use laptops for social networking, online games or homework; and multiple adult passengers to conduct online business or research routes and destinations.

Second, the monthly fees can be lower, at least for laptops. A typical cellular data card for a single laptop costs $60 a month. But Autonet’s service starts at $29 a month for the entire car, regardless of how many devices are being used. A premium plan costs $59. The plans differ by how much data you are allowed to consume monthly. And Autonet requires no special laptop cards or software.

Lastly, the company claims that it has invented a technology that keeps the connection steadier while moving than the typical direct cellular connection. Although some videos froze on me, I never lost Autonet’s Internet connection, whether moving slowly through downtown D.C. or moving faster on suburban highways and streets.

In my tests, with a laptop and an iPhone, Autonet’s speeds ranged from around 100 kilobits per second to around 500 kbps — far slower than a typical cable Internet service in a home. My average speed was between 400 kbps and 450 kbps.

There are some other drawbacks. First, the router costs $499, though that will soon drop to $399 in a holiday price promotion. Second, you have to sign at least a one-year contract, even if you pay monthly. Third, your Internet usage is limited. The $29 plan gets you just 1 gigabyte of data a month, while the $59 plan gets you 5 gigabytes. That should be plenty for most typical users, but not for those with large appetites for data.

These service fees are all-inclusive. You don’t have to pay anything to any cellphone carrier. But there is also a $35 “activation fee,” whose justification is murky, and installation costs are estimated at $50 to $75.

For security, you can set Autonet up with a password, but it doesn’t yet use the most advanced version of Wi-Fi security. The company says that, while it can track and manage your Internet connection, it cannot determine the content of what you are doing online.

Finally, because the router is hard-mounted, you can’t remove it for use in, say, a hotel room or second car.

If you’re willing to invest in the router and can tolerate the slow speeds, Autonet might be what you want — as long as you can resist using it while driving.

Find all of Walt Mossberg’s columns and videos online, free, at the All Things Digital Web site, walt.allthingsd.com. Email him at mossberg@wsj.com.

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