Pro4 Series (4th Gen) - Leader in Home Radon Detection Since 1993. Made in The USA - USA Version pCi/L

Use it for a secondary residence where there is a radon problem.

The SafetySiren Pro4 is a reliable and easy-to-use radon detector that provides continuous monitoring for long-term exposure risks. Setup was straightforward, and within a few hours, it started displaying accurate radon level readings. I appreciate the clear digital display and the built-in audible alarm, which alerts if radon levels rise above safe limits. Since radon is a serious health hazard, having a trustworthy detector is essential, and this unit gives peace of mind. If you’re looking for an affordable, USA-made radon detector, this is one of the best options available.

Easy set up. Don't know how accurate it is but its seems ok.

Very accurate and cross checked its accuracy. Put it in my parents basement where my mother kept getting headaches. It read high. To check its accuracy, I put it in my basement of my brand new house with a radon pump and it read no radon. To say the least, it is accurate when you follow instructions in the package and I feel like it helped mitigate health issues for my family.

We had the professional 72-hour radon test done in our home (the expensive one), and we used this monitor at the same time. The results were almost identical, usually within 0.1 to 0.3 of the pro-grade equipment. That alone made this device worth it. I’ve moved it around the house (basement, bedrooms, living room) and it works reliably everywhere. We even used it before and after installing a radon mitigation system, and the readings matched the professional’s results both times. Is radon really dangerous? There’s a debate all over the internet. But with a dog in the house, I’d rather be safe than sorry. This gives me peace of mind and helps me keep an eye on air quality long-term. Simple to use, easy to read display, made in the USA, and accurate. Highly recommend.