Compatibility check 1: PM2.5, CO2, VOC, radon, or other actual sensors
For indoor air-quality monitors, record the exact value, standard, measurement, or supported condition behind PM2.5, CO2, VOC, radon, or other actual sensors before checkout. A broad category label does not prove that the selected variant fits. Confirm the manufacturer, complete model, hardware revision, electrical rating, protocol, controller support, included parts, and region rather than assuming similarly named products share limits.
Compatibility check 2: measurement range and calibration
Test measurement range and calibration across the actual fixture, circuit, controller ecosystem, radio path, owner account, and manual fallback—not a product-photo setup. If this indoor air-quality monitors fit depends on a neutral wire, hub, bridge, account, subscription, compatible controller, professional installation, or reliable cloud service, confirm the exact part, service, or behavior as part of compatibility.
Compatibility checks 3 and 4: airflow and room placement; local display, history, and data export
For indoor air-quality monitors, airflow and room placement and local display, history, and data export are the limiting conditions most likely to surface only after installation. Measure the smallest clearance, weakest connection, least compatible user or device, and the most demanding normal task. Passing an ideal bench test is not enough.
Prove fit in a reversible order
Use this sequence: identify the pollutant first, place the monitor away from direct vents and sources, establish a baseline, then change one ventilation behavior at a time. Keep labels, packaging, manuals, and the previous system until the product works through normal use and a recovery test. Photograph wiring, measurements, or assembly states that would be difficult to reconstruct.
A failed fit check is a stop signal
Stop when the device estimates rather than measures the needed pollutant or the reading is being used for medical or code compliance without an approved instrument. Do not repair a fundamental mismatch with unapproved accessories, copied settings, or community anecdotes. Use single-purpose particle or co2 monitors when it meets the job with a clearer compatibility path.
