Purpose-built for demanding environments, this IP65-rated wireless hygrometer thermometer combines industrial-grade accuracy with the convenience of Bluetooth monitoring. An embedded Swiss Sensirion sensor samples conditions every 4 seconds, achieving accuracy of plus or minus 1.8% RH and plus or minus 0.36 F across a wide operational range. The unit calculates dewpoint, vapor pressure deficit, and absolute humidity in addition to standard temperature and humidity readings, giving greenhouse managers, HVAC technicians, and serious hobbyists the data they need to make informed adjustments. At just 2.8 x 1.1 x 2.4 inches, it fits inside refrigerators, cigar humidors, guitar cases, attics, and crawlspaces.