Handheld thermo-hygrometer with a probe on a coiled cable that reads ambient temperature, relative humidity, dew point and wet-bulb temperature, plus contact temperature via an included J/K thermocouple input. Logged data is written straight to an SD card at selectable intervals from 1 second to an hour, so readings can be pulled off as an Excel-ready file without separate software. The NIST version pairs this same R6050SD meter with a traceable calibration certificate.