Features: Triple LCD displays Humidity, Temperature, and date (Year, Month, and Day) Programmable from keypad or PC Selectable data sampling rate User programmable audible and visual alarms Wall, desktop, or tripod mount Calibration via optional salt bottles Complete with Windows® compatible software, USB cable, universal AC adaptor, and four AA batteries Accessories: RH300-CAL - Humidity Calibration Kit Specifications: Temperature: -4 to 144°F (-20 to 70°C) Humidity: 0 to 100% Dew Point: 32 to 122°F (0 to 50°C) Memory: Temperature: 8,000 points; Humidity: 8,000 points Dimensions: 4.75 x 3.5 x 1.5" (120.7 x 88.9 x 38.1mm) The 42280 is an Extech Temperature and Humidity Data logger. Data logs up to 16,000 readings. Featuring a USB interface for downloading to a PC. Triple LCD displays humidity, temperature and date (year, month and day). Temperature range from -4 to 144°F (-20 to 70°C). Complete with Windows compatible software, USB cable, Universal AC adaptor, and four AA batteries.