Ambient temperature and relative humidity recorder (1 or 2 channels). Measurement range: -30 +70°C and 0 to 100% RH. Measurement precision: ± 0.4°C from -20°C to +30°C and 2% RH from 20% to 80% RH and 0.5°C above and ± 3.5% RH to 10 from 20% and to 80 from 90% RH