The SD700 CAL DU from Extech Instruments is a comprehensive data logger designed to monitor and record barometric pressure, humidity, and temperature. It features a triple LCD display showing pressure in hPa, mmHg, and inHg, along with temperature and humidity readings. The device records data onto an SD card in Excel format, allowing easy transfer and analysis on a PC. It offers selectable sampling rates from 5 to 600 seconds and includes calibration for measurement accuracy. The instrument supports measurements within specified ranges and resolutions: pressure from 10 to 1100 hPa, 7.5 to 825 mmHg, and 0.29 to 3248 inHg; temperature from 32 to 122°F (0 to 50°C); humidity from 10 to 90% RH. Its compact size is 5.2 x 3.1 x 1.3 inches (132 x 80 x 32 mm), weighing 10 oz (285 g). It is ideal for use in clean room monitoring, warehouse storage, and water damage restoration. The package includes the datalogger, six AAA batteries, SD memory card, universal AC adapter, and mounting bracket.