Amazon has Corentium Home Radon Detector by Airthings 223 Portable for $139.99 with free shipping. You can save $59.96 at checkout. Sale ends in 21 hours.
- Quick results, with your first radon level indication in 24 hours
- Lightweight and portable
- Battery operated with a 2-year battery life
- Unaffected by electromagnetic interference and dust, performs optimally in humidity < 85%