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Best radon monitors for basements

Continuous radon monitors for a basement or lowest lived-in level, compared side by side with where to place one and what the reading means.

A basement is often where radon readings are highest, because it sits closest to the soil. Every continuous monitor below can sit on a basement shelf and record radon hour by hour. EPA's guidance for any home test applies to a monitor too: test the lowest lived-in level, in a room used regularly but not a kitchen or bathroom, away from drafts, high heat and humidity.

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Every figure in one tableEach figure is the maker's own, as its product page or manual states it.

Home radon monitors (32)

Compare side by side
Home radon monitors (32)
ProductHow it measuresPowerScreen and appFirst readingC-NRPP 2024/25
AEGTEST HOUND-1011High-precision semiconductor sensor (maker's words); sampling method not stated by the makerBatteryScreen onlyAfter 6 hoursNot included
AEGTEST HOUND-1011SHigh-precision semiconductor sensor (maker's words); sampling method not stated by the makerBatteryScreen onlyAfter 12 hoursNot included
AEGTEST HOUND-1085High-accuracy semiconductor radon sensor with a triple-vent design to accelerate radon diffusion (maker's words)BatteryScreen onlyAfter 6 hoursNot included
AEGTEST HOUND-3699High-precision radon pulse ionization sensor (maker's words); sampling method not stated on AEGTEST's current storeBatteryScreen onlyAfter 1 hourNot included
AEGTEST HOUND-3786High-sensitivity pulsed ionization chamber (maker's words); sampling method not stated by the makerBatteryScreen onlyAfter 10 minutesNot included
Airthereal RM-63ProHigh precision radon semiconductor sensor (Airthereal specification table)BatteryScreen onlyNot statedNot included
Airthereal RM-65Semiconductor radon sensor counting alpha decays, with air vents on three sides for diffusionBatteryScreen onlyAfter 6 hoursNot included
Airthings Corentium HomeAlpha spectrometry, passive diffusion chamberBatteryScreen onlyNot statedApproved
Airthings Corentium Home 2Alpha spectrometry, passive diffusion chamberBatteryScreen and appNot statedNot included
Airthings View PlusAlpha spectrometry, passive diffusion chamberBatteryScreen and appNot statedApproved
Airthings View RadonAlpha spectrometry, passive diffusion chamberBatteryScreen and appNot statedApproved
Airthings Wave PlusAlpha spectrometry, passive diffusion chamberBatteryApp onlyNot statedNot included
Airthings Wave RadonAlpha spectrometry, passive diffusion chamberBatteryApp onlyNot statedNot included
Aranet Radon OneAlpha decay event detection with an ionization chamber, air diffusionBatteryScreen and appAfter 10 minutesNot included
Aranet Radon PlusAlpha decay event detection with an ionization chamber, air diffusionBatteryScreen and appAfter 10 minutesApproved
Ecosense EcoBluPulsed ionization chamberPlug-inScreen onlyAfter 10 minutesNot included
Ecosense EcoQubePulsed ionization chamberPlug-inApp onlyAfter 10 minutesApproved
Ecosense EcoQube FlexPulsed ionization chamberBatteryScreen and appAfter 15 minutesNot included
Ecosense RadonEye RD200Pulsed ionization chamberPlug-inScreen and appAfter 10 minutesApproved
Forensics Detectors FD-65-RADONAlpha-decay event detector with a radon semiconductor sensor; natural diffusion, no pumpBatteryScreen onlyAfter 6 hoursNot included
GQ Electronics RadonProGQ Radon Gas Sensor (GQ's own name); sensor type and sampling method not stated by the maker. The separate Geiger counter counts radiation and is not the radon measurementPlug-inScreen and appAfter 5 minutesNot included
GQ Electronics RadonScanGQ Radon Gas Sensor (GQ's own name); sensor type and sampling method not stated by the makerPlug-inScreen onlyAfter 5 minutesNot included
GQ Electronics RadonScan-PlusGQ Radon Gas Sensor, described by GQ only as high-sensitivity; sensor type and sampling not stated by the makerPlug-inScreen and appAfter 5 minutesNot included
INKBIRD INK-RD3Passive radon diffusion chamber with an alpha spectrometer sensorBatteryScreen onlyAfter 24 hoursNot included
Kidde Radon Detector (RAB)Semiconductor radon sensor, passive diffusion through side ventsBatteryScreen onlyAfter 12 hoursNot included
PYZYCKYH RD17Semiconductor radon sensing (the maker: "advanced semiconductor sensing"), with temperature and humidityBatteryScreen onlyAfter 6 hoursNot included
SafetySiren Pro4Diffused-junction photodiode sensor (250 V DC); samples the air passing through its ventilation slotsPlug-inScreen onlyAfter 48 hoursNot included
SunRADON lüftSolid-state radon sensor (absolute reading); sampling method not stated by the makerPlug-inApp onlyAfter 90 minutesApproved
TurinSen Hello Radon CPassive radon diffusion chamber with an alpha spectrometry sensorBatteryScreen onlyAfter 24 hoursNot included
X-Sense XR0A-iRContinuous alpha spectrometry, passive diffusion chamberBatteryScreen and appAfter 24 hoursNot included
X-Sense XR0A-SRContinuous alpha spectrometry, passive diffusion chamberBatteryScreen onlyAfter 24 hoursNot included
X-Sense XR0B-SRContinuous alpha spectrometry, passive diffusion chamberBatteryScreen onlyAfter 24 hoursNot included

Questions

Do basements have higher radon levels?

Radon comes from the soil, so the lowest level of a home is usually where it is highest. Only a test shows the level in your home.

Can I use a consumer radon monitor for a home sale?

For a home sale, most buyers, sellers and states rely on a short-term test placed by a qualified tester or a certified kit, run under closed-house conditions; a consumer monitor's reading is useful for your own home but is not usually accepted as the sale's test. Check your state's rules first.

Where should a radon monitor go?

EPA's guidance for any home test applies to a monitor too: test the lowest lived-in level, in a room used regularly but not a kitchen or bathroom, away from drafts, high heat and humidity.

What radon level should I act on?

EPA recommends fixing a home at or above 4 pCi/L and considering a fix between 2 and 4 pCi/L. A monitor's long-term average is the figure to compare with those levels, not a single day.

Further reading