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@Gordon
In the barometer app, as far as I can see you'd want to change MIN and MAX - maybe to -100 and +100: https://github.com/espruino/BangleApps/blob/master/apps/barometer/app.js#L6
Then instead of
drawHand(Math.round(data.pressure));you dodrawHand(...);with a value between -100 and 100?