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Home environment sensors and what their readings mean

Home environment sensors and what their readings mean: people are buying CO2, particle, radon, humidity and noise meters and have nowhere to learn what the…

This launch guide maps the topic, the source base and the practical questions. Check the linked official authority before acting on a rule, deadline, price or safety requirement.

What this guide covers

People are buying CO2, particle, radon, humidity and noise meters and have nowhere to learn what the number means or whether the device is honest.

One page per sensor type: NDIR CO2 versus the cheap "eCO2" that infers CO2 from VOCs and is not a measurement at all, laser particle counters and why they over-read in fog, MOX VOC sensors, radon detectors and passive track-etch film, hygrometers and their drift, thermometers, sound-level phone apps versus a Class 2 meter, water hardness strips, TDS pens and why they say nothing about safety. Each gives the readings that matter, the accuracy the device really has, and a calibration check you can do at home.

How to use it

Use Home environment sensors and what their readings mean to understand the inputs, units and assumptions before relying on an output. A useful result should be reproducible from the named source rather than presented as an unexplained score.

The page keeps the main question, its evidence base and its limits together in one canonical place. That makes it useful as a quick orientation and avoids splitting a broad subject into shallow pages before each narrower answer has enough verified material of its own.

Search vocabulary in four languages

Terminology changes across borders. These are example phrases people use for the same subject in Estonian, Finnish, Russian and English; they are included as a practical vocabulary aid, not as hidden keywords.

Evidence and provenance

The evidence map below records the primary, official or openly licensed material chosen for this guide. It is deliberately visible so a reader can tell the difference between a rule published by an authority, a measured dataset and an editorial explanation.

Source: manufacturer datasheets, published sensor-intercomparison studies (cited), IEC 61672 sound-meter classes and ISO track-etch radon methods (facts cited). · checked 2026-09-09

Source names are preserved even where an authority changes its web address. No figure is added to this launch page unless it is already present in the cited source description or can be computed from a named dataset.

Scope and boundaries

/more/gear covers scales, bands and bottles; this is the instruments that measure a building, not a body.

Connected TempoLife guides

The following paths are the intentional hand-offs named in the brief. They keep adjacent subjects separate while making the next useful reference easy to find.

Why it belongs on TempoLife

/vent and /indoorair.

Frequently asked questions