The Extech RH520A humidity and temperature chart recorder provides precise environmental monitoring with a detachable probe and delivers NIST traceable calibration for accurate readings. It features large dual LCD displays showing humidity (10 to 95%RH) and temperature (-20.0°F to 140.0°F), with simultaneous numerical and graphical outputs, including Dew Point, Wet Bulb, and GPP calculations via LabVIEW™ software. Internal memory can store up to 49,000 data points and transfer data via RS-232 or USB. Ideal for laboratory, clean room, and storage environment monitoring, it offers alarms, easy setup, and versatile mounting options.