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The product is a WBGT index meter, also known as a black ball fever index meter. It is used to measure the Wet Bulb Globe Temperature (WBGT) index, which takes into account temperature, humidity, wind speed, and sun radiation to determine the heat stress level in outdoor environments.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.