When I wrote about the hidden sensors on Android phones, the two sensors that stood out the most were a magnetometer that turns your phone into a metal detector and a barometer, which is supposed to ...

I've had a couple of recent e-mails asking about barometer readings, what they measure and what those readings mean. What a barometer measures is the weight of the air above it. The standard ...

John Carlsen has more than a decade of experience testing and reviewing home tech products, with a major focus on smart home security. He earned his BS in journalism from Utah Valley University. In ...