Cool app if they can fix the local temp/humidity issue
I experienced the same problem as other reviewers (actual temp is 90 degrees but app returned 67degrees), but manually entered in my local temp and humidity and received an appropriate risk level with great recommendations and helpful links when I clicked on precautions. This is a really good concept and is still a useful app (provided you can get the local temperature and humidity from a weather app and then manually enter them here). If they can get the local temp/humidity issue fixed, Ill rank as 4 or 5 stars.
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OSHA Heat Safety Tool