Barometric Pressure adjustment

[mrsmithmanley]

hello I have a meteobridge with acurite smart hub all working, but my pressure is a little high. I disabled the adjusted pressure on the acuright, and just use station pressure. So on the meteobridge I have entered my altitude which is 673 feet above sea level. What number do I use for the adjustment I've looked on the internet but its confusing me somewhat, can anybody help me ? see attached file