radon manometer reading 3

https://myradonfannoisepulse.pinehavenscope.com/posts/when-your-radon-fan-noise-becomes-a-problem

The radon manometer reading sat at 4.2 picocuries per liter, a number I've been tracking since last month. My basement's consistent humidity makes me wonder if the sensor needs recalibration, but I'm just glad it's under the EPA action level.