Date sent: Fri, 11 Feb 2000 08:51:40 -0800 use a 15 psin temperature-compensated absolute pressure sensor and a 24-bit adc such as ltc2400 and throw away the 3 bytes you dont need. 1 measurement per second max with this adc. This is for earth-- different psi for mars etc. alice > Looking for ways to measure small changes in air pessure, in the range of > 0" to 1" of water I guess. I don't know a lot about the different ways to > measure air pressure. > > Both mechanical meters or electronic sensors are okay for me. > > Also, if you can point me to a good 'primer' on air pressure measurement. > > Thanks > > John