We obviously have barometers coming out out ears here, but the pressure was easy to check quickly with online resources, which we explain here home units can be checked as well. We are in sight of the WPOW1 NWS station here, so that is an easy comparison. You can download their data for past 24h and paste into a spread sheet. The 24h data is UTC; the onscreen data is local or UTC. WPOW1 great plot of the pressure and trend and even pressure plus wind. The Lacrosse barograph display on the device is not very useful, but you can download the data to PC, but the process is a bit clunky, and the connection is lost if you close the program. But it will make a plot or you can export to txt and import to excel.
Here is the plot from today at WPOW1. We did the fit backwards in time, so for comparison, I add another flipped over and stretched to match the excel output.
Next we imported both sets of data to excel and then subtracted them. This is a crude test as I am not 100% certain on the times as I had just set up the lacrosse and had to guess a correction since it had stored data with the wrong times in it.... but this does not really matter, it just means it will be easier if done properly.
On the other hand, most electronic units will work well over that range. It is outside of this that is the bigger challenge, ie P > 1025mb and P < 990 mb. We will know this soon and post a follow up or amend this one.
Next we will add part 2 to our ongoing notes on rain now that we have a tipping bucket rain guage at hand.