Meters, Test Kits, Inspection Supplies & Tools!

Safety Siren Radon Gas Monitor & Alarm (HS71512)

Model #: pro3

UPC: 0758773715125

Condition: New

This item has been discontinued and is no longer available

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Upgraded BY MANUFACTURER to Pro Series 4. Link for New Pro Series 4

The following links, images and information remain available for informational purposes only.

The Pro Series 3 electronic radon gas monitor & alarm meets EPA Performance Criteria of the CR protocol.

Our electronic radon gas detector/monitor is a proven performer being in service since 1996. Used by inspectors, consultants and homeowners to monitor the radon gas levels in schools, offices and residences. It is a solid state continuous radon monitor which utilizes patented technology. At the heart of the device is a measurement circuit and pulse processing software which records alpha events on a photovoltaic sensor. Radon daughters create a spark when they come in contact with the potential across the collection dome and the photovoltaic sensor counts these pulses. The software equates pulse volume into pCi/L (Pico Curies per Liter) and then displays the information on the LED display. 
  • Made in the U.S.A.
  • No wiring or batteries needed, uses typical 110v household current
  • Entela Certified
  • Results will display in approx 48 hrs on a numeric digital LED display
  • Shows the level of radon gas in pCi/L on a short-term or long-term basis
  • 2 modes of measurement - long & short term
  • Alarm sounds:
    • Long-term measurement reaches 4 pCi/L or greater (can be silenced)
    • Short-term measurement stays above 4 pCi/L for 30 consecutive days
  • Samples air continuously; display updated every hour.
  • Self-test every 24 hours with an error code displayed if failure.
  • 10' power cord supplied
  • Menu button controls 4 functions. Re-set unit and use in different locations.
  • UL61010B-1:2003 Issued: 1/24/03 Ed: 1 Standard for Safety Electrical Measuring & Testing Equipment; Part 1: General requirements
  • CSA C22.2 NO 1010.1-92 - Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use, Part 1: General requirements
  • 10 year sensor and a 1 Year warranty


  • Sensor: Ionization Chamber
  • Sensor voltage: 250vDC
  • Full scale reading: 0.1 to 999.9 pCi/L
  • Operating temperature: 32° to 104° F (0° to 40° C)
  • Storage temperature: -4° to 185° F (-20° to 85° C)
  • Audible Alarm: 85dB at approximately 10' away
  • Beeps every hour if:
    • long-term readings are 4.0 pCi/L or greater or
    • short-term measurement stays above 4.0pCi/L for 30 consecutive days
  • Averaging frequency: Levels will be updated on the display every hour
  • Short-Term: Average over the past 7 days
  • Long-Term: Average from the time of last reset (5 year max) resets after 5 years
  • Accuracy: ±88% pCi/L (click here to see accuracy report in PDF format)
  • Dimensions: 4.7" x 3.1" x 2.1"
  • Follow this link for more technical info (will open in new window)

Supplied with:

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Search Category: Home & Garden > Flood, Fire & Gas Safety

What our customers say...

To whom it may concern: Great invention! The last electronic radon detectors we bought were well over $500. We have been doing some informal comparisons and found the Pro Series to be as accurate as the pricey units. Thanks.

Rated by Jonathan Watters

Rated by Jack Dietz

Rated by Jackson P.

Rated by Peter S.

Rated by M. Whinters


Rated by Leslie W.

Rated by Martha Alberts

Rated by Tony Weems

Rated by Sam Shores

Rated by N. Queens

Rated by D. Jones

Rated by Matt Herdegen

Rated by P. Whitsock

Rated by Mr. Dave

This is the second such radon meter in the past 10 years. We are very satisfied with the first one's performance. Thanks

Rated by Robert Porcella

Rated by Doug Christ

As promised I evaluated this detector in many conditions and it is very accurate. I would recommend it I found it to be a very good deal. I spent more in postage testing my home the old fashioned way.

Rated by S. Lett

To whom it may concern, thanks for your great help. I just wanted to say thanks for the quick response, help with my questions, and just plain overall great service that you provided. I can't now remember the name of who I spoke with on the phone, but he ensured that my order got right out for overnight shipment even though it was right at the cutoff time late in the afternoon. The item arrived within 24 hours. I look forward to doing business with you again in the future, and have already recommended National Safety Products to a couple of friends as a source for test equipment. Thanks again, Barry

Rated by Barry A.

Without a doubt worth the money! My levels were 38 pCi/L! 34 pts. higher than the safety level set by the government. Thank YOU for an excellent user friendly product and for possibly saving my family's life. HIGHLY RECOMMENDED!

Rated by Tim Foss

After using it the first time I am confident that it will help me save money will lowering my Radon leven myself. I have used two mail in kits in the last year and found my level to be at 10 pCi/L. I then purchased a Pro series II detector- its initial reading was 10 pCi/L!


Best radon detector device available;accurate and dependable;detector merits a 5 star rating

Rated by A. Sannino

I am happy with my radon detector and am glad I had it when the guys were doing my basement (making it into an apartment). We were able to fix a potential problem before it was too difficult to gain access after the completion. Although the levels weren't that high (8-9), it only cost me about $200 to get the levels below 4. The radon mitigation contractor was so impressed with your monitor he said he will be recommending them on all of his jobs. The one he used to sell was several hundred dollars & did not have an audible alarm. He was telling me that the audible alarm is an excellent means by which to know when it is toime to have my remediation system serviced. My only recommendation would be to let more people know about your product. You may save some lives! Thanks

Rated by Jason Powell

Very pleased with the Pro series radon detector. In fact we purchased another one for the upstairs living area. Two is really better than one.

Rated by Richard Smith

Thank you. We just discovered very high readings in my 7 year old son's bedroom. We set out to reduce the levels ourself & with each improvement we were able to re-set the detector & within a few days we could see our new readings. We were able to do this over a 2 week period and successfully lowered the level to a safe reading. We now keep the radon detector in his room to alert us should the levels go back up. I just wanted to thank you & your staff for putting together a very informative site that helped us. Before coming to your site we had only heard of radon. Now we may have added years of happiness to my son's life. I just can't thank you enough, The Thompsons

Rated by Mary Thompson

This unit beats all! EPA approved and measurement in tenths makes this unit the best yet. Accuracy is unbelievable. Great job guys! Staff member

Rated by Thomaz Mazziocci

The Pro 3 Radon Monitor is easy to setup and use. For the price, it?s the best device of its kind on the market. I highly recommend this unit to anyone who is concerned about radon or has a mitigation system in their house.

Rated by J. PERROTTA

We are using several of the Pro3 detectors in the field. It works well and we sell them to the clients that have high levels. They are sold once they see this unit in action!! This unit is nice and compact. A discount on quantities would be great, but I understand there is a big demand on them now. Thanks

Rated by E. J. Kohler

Greetings! Thanks for a smooth transaction. I will buy from your company again.

Rated by A. Maendel

Is there other models? I see this one is Pro3, is there a Pro4 or Pro2? It works and all I was just wondering.

Rated by Michael A.

Quick Shipping. Arrived working & in good shape. Accuracy checked good along side of laboratory comparison. Would recommend your company and radon detector. Regards

Rated by J. Ehrenreich

My new replacement detector just arrived. My original detector was damaged by the Post Office & I was impressed by how your customer service department responded. I will recommend your company in the future.

Rated by lester connelly

Arrived quick. It works.

Rated by Marget Dubois

Rated by Ted

Rated by Oden Bryzinski

Good Unit to provide the Landlord with Data on Radiation Levels in the basement to get him to fix the leaks. A Display like those on my Hundred dollar cell phones would have been better. Button to switch from trending display showing counts recv'd each hour as well as a Bar Chart Display to show the the Different Energy Levels of the Pulses (this shows you which isotope is causing the pulses and whether or not you are getting "New" Alpha Radiation or "Old" Daughter related components). Plus, you would expect more pulses to come in during a rainstorm, etc. and this would show up on the Display. ***The other improvement would be a USB Connection feeding the Energy Level of each pulse; time; Humidity, Pulses accumulated in one hour, etc. into a portable computer. The information is then easily compiled into an Excel Spreadsheet or Database Program...providing a lot more useful info than just a 0 to 999 Display w/alarm. Overall, a good design. Now, if my cell phone could just detect Alpa would be perfect!

Rated by J. Grossman

We ordered the Radon Detector and found we had high levels of radon. We continued to monitor our home for radon and eventually called in a professional radon mitigator who confirmed the high levels. Thanks to your product we were alerted to a very real danger in our home and motivated to take the steps necessary to reduce the radon levels. This is a great product that can save lives. Thanks!

Rated by Carson Family

This gas monitor was great. It worked exactly as promised. The tests revealed that our new home had high (+4.0pCi/L) radon gas levels and as a result we decided to have our home mitigated.

Rated by Frank T.
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