Conditional verdict: Consider Aranet Radiation HOME for passive ambient-equivalent dose-rate trends, firmware-integrated dose and interval-dependent app history.[1][5] Its PIN-diode detector is not a Geiger-Müller tube.[1] This is a conditional documentation-based choice, not a medical, contamination-clearance or safety/compliance recommendation.
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What it measures—and what it does not
The TDSNUCH1 uses a PIN diode and is specified to detect gamma, beta, and x-rays. Its principal readings are ambient-equivalent dose rate in microsieverts per hour (0–1000 µSv/h, or 0–100 mrem/h) and ambient-equivalent total dose in millisieverts (0–1000 mSv, or 0–100 rem). Total dose is produced by numerical integration of dose-rate readings in the firmware; it is not a separate direct measurement of tissue-absorbed dose. [1]
The accumulated indicator is not tissue-absorbed dose, isotope identification or proof of contamination absence. Do not treat a displayed number as a medical conclusion or location-safety verdict.
Accuracy is conditional, not universal
The published ±20% accuracy applies to gamma measurements from 200–1500 keV, with calibration using a Cs-137 reference source. The datasheet separately lists a full photon range of 80–1500 keV. Those are different claims: the wider range does not turn every reading into a ±20% result. [1]
Detection is not the same as calibrated quantitative interpretation. The datasheet limits its stated accuracy to gamma in the calibrated band and identifies limitations for beta and low-energy x-ray responses.[1] It separately warns that x-ray response does not establish precise quantitative intensity.[1] The 0.01 µSv/h resolution in its 0–10 µSv/h row and three significant digits in the 10–1000 row are display specifications, not achieved uncertainty.[1]
The leaflet gives a broader “70–1500 keV (±20%)” statement.[3] That conflicts with the datasheet’s 80–1500 full photon band and narrower calibrated-gamma claim.[1] Use the explicit calibration scope, without inventing an older-versus-newer shipment explanation.
Rate, averaging, and first readings
The default five-minute interval is selectable as one, two, five or ten minutes; a configurable threshold can trigger temporary one-minute measurements.[1][4] Separately, dynamic averaging spans 1–60 minutes according to intensity.[1] Recording cadence and averaging window are not interchangeable.
Do not read the first screen as instant precision: the datasheet describes lower initial accuracy while measurement history develops, with a progress bar.[1] Measurement intervals and averaging windows are different. A five-minute setting does not establish a new independent five-minute observation every time the display changes, and one-minute operation does not guarantee one-minute accuracy.
Integrated dose and the two-year boundary
The total-dose range is 0–1000 mSv with a two-year dose-accumulation time limit.[1] At that limit, dose continues to update but the accumulation-time value stops increasing.[1] This is not a two-year archive of individual observations. The quick-start guide warns that resetting permanently loses data; this review does not provide a reset or battery-compartment procedure.[2]
Quick-start colors and dimming include a 0.20 µSv/h reference.[2] They are interface cues, not personal medical thresholds or permission to remain in an environment.
History, app dependence, and data quality
Historical storage depends on the selected interval: approximately six days at one minute, 12 days at two minutes, 30 days at five minutes, and 60 days at ten minutes. The sensor exposes that history through the Aranet Home mobile application. [1][3][5] This creates a trade-off: shorter sampling gives a tighter time scale but less look-back; longer sampling gives more days but less temporal detail.
Changing intervals restructures the stored history: shorter-to-longer settings aggregate values, while longer-to-shorter changes pad the record with repeated values.[1][5] Those repeated entries are not newly measured independent samples. Background downloads require the app to run in the background with “Background data read” enabled.[5] These documents do not establish automatic CSV export, cloud retention or tested feature parity across current phones.
Physical fit, power, and ownership expectations
The datasheet lists two AA alkaline batteries and a configuration pin as package items, IP20 protection, 0–50°C operation and 0–85% RH.[1] It does not establish the seller’s actual carton or validate use beyond those device limits. The HOME quick-start explicitly labels base-station and LoRa functions non-functional; its documented mobile path is Bluetooth with Aranet Home.[2]
Battery-life estimates depend on interval, chemistry, Bluetooth and reference conditions. The datasheet describes mathematical extrapolation at 20°C with named reference cells, excludes out-of-turn high-radiation measurements and expressly disclaims a lifetime guarantee.[1] The retail four-year headline is therefore not proof that an individual unit runs uninterrupted for four years.[6] No charger, case, individual certificate or calibration source was established as included.
The quick-start calls the pulse buzzer On by default, while current Help calls audio-alarm notifications disabled.[2][4] Those labels may refer to different functions; their relationship is unresolved here. Confirm the relevant indicator rather than relying on an assumed default or treating an audible prompt as safety assurance.
The datasheet conditions its information on firmware and warns against direct sunlight; the quick-start warns about strong acceleration and high humidity.[1][2] Neither portable construction nor battery chemistry expands those limits.
Who should buy it—and who should skip it
Consider it for passive, documentation-led ambient-equivalent dose-rate comparisons and the associated integrated-dose/history record, where those limits suit the question. The datasheet names Radiation Sensor HOME, product TDSNUCH1.[1] The selected ordinary offer is B0CWLLM526, titled SAF Aranet Radiation, with SAF Tehnika in its manufacturer field.[6] That correspondence does not verify the firmware or individual calibration of the unit shipped.
Skip it for isotope identification, precise beta/low-energy x-ray intensity, contamination clearance, legal exposure records or medical/workplace compliance. This review does not recommend acquiring or approaching a radioactive source, deliberately exposing the sensor, or treating a color threshold as safety authorization.
The buying decision
Shortlist for a defined ambient-equivalent rate, integrated-dose and app-history record—not safety approval. Calibration scope and data processing limit what the numbers establish.[1][2][5]
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Sources
Based on the official four-page TDSNUCH1 datasheet v1.3, eight-page quick-start and two-page leaflet, recovered through exposed download routes.[1][2][3] Official Help supplies defaults and storage details.[4][5] These documents do not establish the selected offer’s shipped firmware or individual certificate.[1][6]