Extech usb humidity temperature pressure data logger with windows software extech rht50 the extech rht50 usb humidity temperature pressure data logger logs up to 10 000 samples at a user programmable sample rate it can monitor humidity temperature and air pressure in clean rooms warehouses storage rooms freezers shipping vans and water damage restoration the rht50 s usb connector easily plugs into a computer for data analysis and setup using the supplied windows software also sup