radon manometer reading

https://acornmetric.com/s/vbAu_JSi4X__xHnfXXIL2

The radon manometer reading hovered at 4.2 picocuries per liter, a number that made me pause. It's not alarmingly high, but it's above the 2.0 pCi/L action level recommended by some agencies. I remember the test kit instructions perfectly: keep windows closed, set it up in the basement, and wait at least 48 hours before sending it off. Seeing that digital display now, honestly, it just makes me think about calling a mitigation specialist to be safe.