The LPS001WP silicon pressure sensor employs MEMS technology to provide high resolution measurements of pressure and altitude. Available in an ultra-compact and thin package, it is highly viable for use in smart phones, sports watches, weather stations, automotive and industrial applications, and other portable equipment. The sensor consists of a flexible silicon membrane sitting above an air cavity with a controlled gap and defined pressure. Protected from breakage by built-in mechanical stoppers, the membrane includes a piezoresistor. Its change in resistance is monitored, thermally compensated, and converted to a digital value. The device specifies an operating pressure range of 300 to 1100 millibar, corresponding to the atmospheric pressures between -750 and +9000m relative to sea level, and can detect pressure changes as small as 0.065 millibar, corresponding to 80cm of altitude. Price is $2.80 each/1,000. STMICROELECTRONICS, Lexington, MA. (888) 787-3550.