Out of her own "frustration" with shopping, businesswoman Tanya Shaw has come up with a whole-body scanner that records all your measurements to end all sizing dilemmas.

Placed only in US malls for the moment, the futuristic cabin scans every centimeter of the motivated shopper, printing out a "report card" of a combined 200,000 measurements, which are matched to what the mall's brands - so far including Levi's, DKNY Jeans, Gap, and Guess, among others - have in store.

Armed with this guide, shoppers can then let salespeople point them directly to the right items - a godsend as anyone who has ever looked for the perfect jeans will confirm.

The service, called My Best Fit, is free for customers and financed through brands paying the moment they're recommended. They can't, however, pay in order to be recommended.

Sounds too good to be true? Maybe. Fashion blog Styleite rightly criticizes that "there's a difference between something [being] fitting and something being flattering - and just because a pair of jeans are the right size, it doesn't mean they're the best pair for you."

The first My Best Fit scanner can be found at the King of Prussia mall in Pennsylvania, but Shaw plans to install 13 more by the end of the year, and 400 more in the coming two-and-a-half years.

Watch a demonstration at http://abcnews.go.com/GMA/Consumer/.