The only substantial rainfall we’ve had since I installed my Tempest showed as 2.3" in my old plastic tube gauge and 1.59" on the Tempest. I imagine the tube is reasonably accurate as this is old technology. When I was looking into the Tempest, I got the impression that accuracy would be within 10% but I don’t remember where I read that.
Have users found their Tempests to be off by the same amount consistently or does it vary with intensity of the rain, wind, etc.?