Description
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The testo 625 is a compact instrument with an integrated humidity probe head for the measurement of air humidity and temperature. The large two-line display quickly and reliably shows humidity, Wet Bulb temperature or dewpoint, as well as temperature.
https://media.testo.com/media/32/27/b950778ab864/testo-625-Data-sheet.pdf
Manual_Testo625_Humidity+Temperature