Until now, all digital underarm thermometers borrowed their form from the old mercury thermometers. The design team discovered that changing the shape from straight to curved makes a thermometer a lot more comfortable and visually communicates to the consumer that it's not for oral or rectal use. The new shape snugly fits into the underarm cavity with a probe that mates with the "hot zone." Better ergonomics and a friendlier look make taking a child's temperature a lot less hassle.