Extech HT30 Heat Index Meter has a Heat Stress Index that can measure how hot it feels when humidity is combined with temperature, air movement, and radiant heat. This meter has a Black Globe Temperature (TG) that monitors the effects of direct solar radiation on an exposed surface.
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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Replaced by New 2023 Testo 625
