Ever wondered how well those energy meters for tracking your home energy consumption work and which one is the best for your particular home? You don’t have to wonder anymore!

The UK’s Energy Saving Day organization has joined forces with BBC’s former head of comedy (Jon Plowman) to produce a relatively complete review of the most popular energy monitors (including ones like Home Joule, Kill-a-Watt and Wattson) on the market today, and it’s available via YouTube video for anyone to view (in two parts, first part above, second below).

In this somewhat light-hearted look at energy monitors, Plowman walks through a good number of devices available on the consumer market one by one. He talks through how each of them works—where they connect, what they measure, how the display functions, and more—and identifies for each one some of the pros and cons of choosing it. In particular, he talks about cost and granularity of detail, two important factors in any energy monitor purchase.

Regardless of which device you select for your home, you can be guaranteed that you’ll save power every month if you pay attention to the readings. That’s the understanding Energy Saving Day is operating under. They believe that households in the know about their energy use are households with the power to cut their energy consumption.

It’s no surprise, either. If you discover, all of the sudden, that your refrigerator is adding a big load to your energy consumption and do the math to find out how much you’d save with a more efficient model, you’re more likely to replace it with something more power-saving. Their website points out that an energy monitor can help homeowners reduce energy consumption by as much as 10 to 20 percent annually.