Measurement guides
Understand what a reading measures, how placement changes it and what it cannot prove.
Relative humidity
Understand what relative humidity measures, why temperature changes the percentage and how placement affects interpretation.
Air temperature
Use stable, time-stamped air temperature readings as context rather than proof of a hidden building condition.
Dew point
Calculate and compare dew point with surface temperature while preserving the uncertainty of consumer sensors.
Carbon dioxide
Use CO2 as a ventilation and occupancy context signal, not as a complete indoor-air-quality diagnosis.
Particulate matter
Interpret PM1, PM2.5 and PM10 trends with source events, sensor limits and outdoor comparison.
Volatile organic compound sensors
Treat broad consumer VOC readings as trend indicators that cannot identify a specific chemical source.
Radon measurement
Use approved duration, placement and follow-up principles while deferring to jurisdiction-specific action guidance.
Surface temperature
Measure comparable surfaces with emissivity, distance and reflection limitations clearly documented.
Wood moisture content
Use species, temperature, pin placement and reference-material context before interpreting wood readings.
Pinless moisture indication
Use comparative scanning to locate anomalies without converting an instrument scale into absolute moisture content.
Airflow indication
Compare grille and transfer-path behavior with suitable instruments while avoiding combustion or equipment interference.
Pressure difference
Measure small pressure differences only with known reference points, stable conditions and safe equipment boundaries.
Crack width
Record scale, orientation, endpoints and repeat interval so width changes can be distinguished from measurement noise.
Sound level
Use sound level and frequency context for comparison while recognizing phone and consumer-meter limitations.
Odor intensity log
Use a consistent descriptive scale, location and timing without treating odor strength as exposure or source identification.
Weather correlation
Align observations with rainfall, wind, temperature, humidity and snowmelt using exact timestamps.
Water-meter leak check
Use a controlled no-use window to identify unexplained flow while accounting for automatic appliances and irrigation.
Infrared camera
Interpret thermal patterns as surface-temperature differences requiring confirmation, not as moisture images.
Hygrometer placement
Choose height, distance from surfaces, stabilization time and control locations before comparing humidity.
Data logger setup
Set intervals, clocks, sensor locations and event notes so trends remain comparable and reviewable.
Drying-rate tracking
Compare repeated readings at fixed points and conditions while recognizing material and instrument uncertainty.
Drain-flow timing
Time a repeatable fixture event without overfilling, chemical use or dismantling and document downstream symptoms.
Indoor-outdoor comparison
Pair indoor measurements with outdoor conditions and timestamps to avoid interpreting the house in isolation.
Instrument check and calibration
Verify batteries, zero checks, reference conditions, firmware and stated accuracy before relying on a trend.
