continuous radon monitor 2

https://radonlevelsstlouisnotes.clearhavendigest.com/posts/understanding-radon-levels-st-louis-homeowners-need-to-know

A continuous radon monitor sits quietly in the basement, tracking the invisible radioactive gas that seeps from the ground. Every hour it samples the air, displaying a rolling average of radon levels. If readings climb above safe thresholds, it beeps a warning, giving you a chance to vent the space before long-term exposure becomes a concern.