Memory Size:43,344 temperature; 21,672 temperature, RH and dew point.Temperature Range:15 to 150°F (-10 to 65°C).Temperature Accuracy:±1°F (±0.5°C).Temperature Resolution:0.01°F (0.01°C).Humidity Range:0 to 99% RH.Humidity Accuracy:±2% RH, from 10 to 90% RH.Humidity Resolution:0.01% RH.Sampling Method:Stop on memory full or continuous recording.Sampling Rate:second to 18 hours, 1 second increments.Computer Requirements:Windows® 98 and above (software included).Power Requirements:(3) AA alkaline batteries, installed functional, user replaceable.Alarms:Programmable high/low.Interface:USB port (cable included).Weight:7 oz (20 g).Agency Approvals:CE.