Featuresmemory for 32000 readings (16000 temperature and 16000 humidity readings) dew point indication status indication USB interface for setup and data download user-programmable alarm thresholds for temperature and humidity analysis software multi-mode to start logging long battery life selectable measuring cycle: 2s/5s/10s/30s/1m/5m/10m/30m/1h/2h/3h/6/12h/24h comes with: protective cover, mounting clip, English software (Windows® XP & Vista), manual, battery spare battery: DVM171-BAT Specificationsrelative humidity : overall range : 0 ~ 100% ± 5.0% accuracy (0% ~ 20% and 80% ~ 100%): ± 5.0% accuracy (20% ~ 40% and 60% ~ 80%): ± 3.5% accuracy (40% ~ 60%): ± 3.0% temperature: overall range: -40°C ~ 70°C (-40°F ~ 158°F) accuracy: (-40°C ~ -10°C/+40°C ~ +70°C) ± 2°C accuracy: (-10°C ~ +40°C) ± 1°C dew point: overall range: -40°C ~ 70°C (-40°F ~ 158°F) accuracy: (25°C, 40 ~ 100% RH) ± 2.0°C (± 4.0°F) logging rate: selectable sampling interval: from 2 seconds up to 24 hours, operating temperature -35°C ~ 80°C (-31°F ~ 176°F) power supply: 3.6V lithium 1/2 AA (LS14250incl.) battery life: ± 1 year dimensions: 101 x 25 x 23mm weight: 42g