TFA Thermo-Hygrometer Comfort – Thomann United States
Amazon.com: Temperature & Humidity Thermo Hygrometer (Temperature Range: 14°F to 122°F) for Indoor Environment Along with Calibration Certificate | Model: HTC-1 Pack of 2 : Industrial & Scientific
Traceable 37950-01 Thermo-Hygrometer with calibration, RS-232, 0 to 122°F