Features: Wide operating temperature range: -40 to 185°F (-40 to 85°C) Humidity range: 0 to 100% RH Records up to 16,000 readings (8,000 readings for each parameter) Use in storage containers, shipping vans, freezers and more Logs data for days, weeks or months - up to 1 year battery life Programmable sampling rate from 1sec to 12hrs plus Hi/Lo limits with alarm indication LCD displays current temperature/humidity Requires 42275 docking station for programming and data download Specifications: Temperature: -40°F to 185°F (-40°C to 85°C) Humidity: 0 to 100%RH Datalogging Interval: 1 sec to 12 hours Memory: Temperature: 8000 points; Relative Humidity: 8000 points Dimensions: 3 x 2.3 x 0.88" (76 x 57.2 x 22.3mm) The 42270 is an Additional Humidity and Temperature Datalogger for use with Extech 42275 and 42276 Kits. Datalogger measures temperature from -40 to 185°F (-40 to 85°C) and relative humidity from 0 to 100%. It can record up to 8000 readings of each parameter. Meter has a programmable sample rate of 1 second to 2 hours plus high and low alarm. A 42275 or 42276 kit is required to connect the datalogger to a PC for programming and data retrieval.