Radon:

The standard deviation from the exact radon level is σ ~ 7 % ± 5 Bq/m³ after 24 hours (US: σ ~ 7 % ± 0.15 pCi/L) and σ ~ 5 % ± 2 Bq/m³ after 7 days (US: 5% + 0.05 pCi/L)

Temperature:

0.2°C resolution, ± 1°C accuracy (US: 0.36°F resolution. ± 2°F accuracy)

Humidity:

0.5% RH resolution, ± 4.5% accuracy

Barometric pressure:

0.018 inHg (0.06 kPa) resolution, 0.295 inHg (± 1 kPa) accuracy