AcuRite 01080M Pro Accuracy Temperature and Humidity Gauge with Alarms, Black EASY TO READ: Measures indoor temperature and humidity from -4 to 158F (-20 to 70C) and 1-99% RH with large, bold numbers PROFESSIONAL ACCURACY: Provides accuracy of +/- 0.5F, +/- 2% RH with manual calibration option for data you can trust UP-TO-DATE INFORMATION: Measures conditions every 10 seconds to quickly identify changes in temperature and humidity, as well as displays high / low records for past 24 hours and for all-time ALARM NOTIFICATIONS: Custom, programmable high and low humidity alarms to let you know when humidity levels are outside of your desired ranges, and a colorful humidity level indicator (LOW / OK / HIGH) at the top of the display provides at-a-glance information so you know whether humidity levels are within recommended ranges INDUSTRY-LEADING SUPPORT  Includes a limited 1 year warranty as well as access to our knowledgeable US-based customer service team.