Has anyone ever used this digital barometer?
I just discovered it and bought one. It's a little over $100 and offers a surprising resolution of 0.004 inHg. There are some problems however. It runs on a 9V battery and turns out to be sensitive to battery voltage. It is also very sensitive to temperature. The last thing: it does not come with absolute calibration -- the user must determine an appropriate offset for their unit.
So far, this doesn't sound too good. But, on the plus side, it comes with a temperature sensor that can be used to "fix" the temperature problem in software. I've hooked this barometer up to a well-regulated 9 volt power source instead of the battery and with temperature correction it appears to be surprisingly accurate. The readings are lining up quite well with the MADIS analysis provided through CWOP -- right now a 3-day analysis is showing an average error of 0.01 inHg and a standard deviation of 0.006 inHg. Not bad for such a cheap little unit!
For those who have a little electronics experience and enjoy science projects, you could get a pretty accurate barometer for $200 or maybe a bit less. I've posted a little more information about this here:
http://wmrx00.sourceforge.net/WeatherJack/weatherjack.html