[3-in-1 Multi-functional Heat Stress Meter] This -881W anemometer features real-time, MAX, MIN, and wind speed reading functions, and can measure wind temperature, humidity, and black globe temperature. The -881W is ideal for measuring weather and surrounding climate conditions.[High Precision Wind Speed Meter] The -881W wind velocity meter is equipped with 7 sensitive wind vanes for more accurate measurement. Wind speed range: 030 m/s, resolution: 0.1 m/s (accuracy: 5% digit). Multi-unit switching allows selection of different wind speed units (m/s, km/h, ft/min, knots).[Temperature & Humidity Meter] Measures ambient temperature and humidity. Temperature range: 050C (accuracy: 0.6C), switchable between C and F; humidity range: 0.1%99.9% RH (resolution: 0.1% RH).[WBGT Alarm] This -881W heat stress meter includes a WBGT alarm function with a temperature range of 050C and alarm set range of 2050C. The WBGT alarm helps monitor environmental heat stress and reduce risks associated with high temperature and humidity. A 4-level display indicates heatstroke danger levels for easy interpretation.[Wide Range of Applications] The -881W heat index stress meter, air globe temperature, and humidity tester is a valuable tool for HVAC systems, drones, surfing, sailing, kite flying, climbing, home appliance maintenance, outdoor activities, and industrial production. Suitable for use in buildings, steel foundries, brick factories, glass facilities, boiler rooms, mining areas, training events, marathons, and seaside activities.[Additional Features] Features an LCD display with backlight for use in low-light environments and easy data reading. Low battery indicator alerts when battery power is low. Compact and portable design makes it convenient to carry for work or travel.Specifications: Wind Speed Range: 030 m/s Wind Speed Accuracy: 5% Wind Speed Resolution: 0.1 m/s Wind Speed Units: m/s, ft/min, knots, km/h Temperature Range: 050C Temperature Accuracy: 0.6C Temperature Resolution: 0.1C Humidity Range: 0.1%99.9% RH Humidity Resolution: 0.1% RH WBGT Temperature Range: 050C WBGT Alarm Range: 2050C Power: 1.5V (AAA) x 2 batteries (not included) Color: Yellow Material: ABS Package Contents: 1 x -881W Digital Anemometer 1 x English Manual Note: Light reflection and different display settings may cause slight color variations between the image and the actual product. Measurement error allowance: 13 cm.