The Ambient Weather WS-HE01 Portable Heat Meter features an easy to read arrow display showing all ranges of dangerous heat conditions. The Heat Index monitor is critical for outdoor activities that involve strenuous exercise. Ideal for athletic directors and school sports. The Ambient Weather Portable Heat Meter features an easy to read arrow display showing all ranges of dangerous heat conditions. Other functions include: accurate display of actual temperature in both Fahrenheit and Celsius, as well as relative humidity and dew point. The Ambient Weather WS-HE01 has an IPX rating of IP44, meaning it is effective against solid objects greater than 1 mm, and water splashing against the enclosure from any direction. Adjustable Audible Alarm The adjustable, audible warning sounds before heat index reaches critical levels. Calibration Feature The calibration feature allows you to adjust the temperature and humidity for the upmost accuracy. The WS-HE01 is also an accurate digital psychrometer, directly measuring temperature and humidity with calibration capability. Abundant Applications Applications include outdoor sports, athletic trainers, HVAC, scientific and educational research. The Dew Point monitor is important for indoor applications, including HVAC, mold growth and comfort level. Outdoor applications include agricultural and thunderstorm prediction. Weather Features Temperature Humidity Dew Point Heat Index 30 second update Interval IPX4 water resistance Heat Stress Levels Caution Level Range: 80 to 90 Caution Level Notes: Fatigue is possible with prolonged exposure and activity. Continuing activity could result in heat cramps. Extreme Caution Level Range: 90 to 105 Extreme Caution Level Notes: Heat cramps and heat exhaustion are possible. Continuing activity could result in heat stroke. Danger Level Range: 105 to 130 Danger Level Notes: Heat cramps and heat exhaustion are likely; heat stroke is probable with continued activity. Extreme Danger Level Range: over 130 Extreme Danger Level Notes: Heat cramps and heat exhaustion are likely; heat stroke is probable with continued activity. Which Weather Instrument Is Right for You? Ambient Weather is a market leader in weather station and environmental monitoring instruments, serving customers since 1998. We provide solutions and software tools for the home and office, industry, schools, resorts, government and the media. Which Weather Instrument Is Right for You? Ambient Weather is a market leader in weather station and environmental monitoring instruments, serving customers since 1998. We provide solutions and software tools for the home and office, industry, schools, resorts, government and the media. WS-HE01 WM-5 WH32B Add to Cart Add to Cart Add to Cart Customer Reviews 4.0 out of 5 stars 107 4.1 out of 5 stars 70 4.5 out of 5 stars 84 Price $36.99$36.99 $139.99$139.99 $28.99$28.99 Instrument Type Heat-Stress Meter Weather Meter Mini Weather Station Location Outdoor Handheld Outdoor Handheld Indoor / Outdoor Mounted Measurements Temperature, Humidity Temperature, Humidity, Pressure, Altitude, Wind Speed Temperature, Humidity, Barometric Pressure Calculated Values Heat Index, Dew Point Heat Index, Windchill, Dew Point - no data Update Interval 30 seconds 2 seconds Wind, 1 minute Temperature & Humidity, 15 minutes Pressure 60 seconds Features & Notes IPX 4 Jacknife case; Floats; Water resistant up to 4 in Connects to Ambient Weather Network, Weather Hub, and Display Consoles; IPX4 Temperature Range 14 to 140 °F, ± 2 °F, 0.1 Resolution Humidity Range 20 to 90%, ± 5%, 1% Resolution Dimensions 3.5 x 3 x 1 inches Power Requirements 2 x AAA 1.5V Alkaline or Lithium batteries (not included); Battery life approximately 1 year