Testo 635-1 Digital Thermal Hygrometer is a high quality temperature and humidity meter. Testo 635-1 offers the possibility of testing and analyzing air humidity, material moisture, U-value and the dewpoint in compressed air systems. Along with the input probes, the Testo 635-1 includes a wireless probe feature to assist with measurements of difficult places.
Proposition 65 Warning for California Residents: This product can expose you to chemicals including Benzene, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to 
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