Consumer Reports tests small, inexpensive devices that can help people get on the right health track and stay there.
Consumer Reports tested two types of pedometers. The more elaborate ones are worn on the wrist and measure speed and distance, not steps.
"These work by using GPS technology to do their calculations. That means they work best outside," said Consumer Reports Marc McEntee.
Unfortunately, during testing the satellite connection occasionally dropped out so the pedometers couldn't always give a reading.
And they're pricey, too, around $200.
More basic pedometers count steps by detecting motion and are clipped on at the waist or put in a pocket.
"Accuracy was measured by comparing the results of the devices to the treadmill step count, which we know to be correct." said McEntee.
Of the eight pedometers tested, Consumer Reports named the $30 Omron Pocket pedometer a Best Buy. It was the most accurate at all speeds, even when kept in a pocket.
The American Heart Association says a goal of 10,000 steps a day is a good one. That's the equivalent of four to five miles depending on your stride.