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Wet Bulb Black Globe Thermometer 75mm (WBGT8778) Heat Index

Model #: WBGT8778

UPC: 681035013083


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The Wet Bulb Globe Temperature (WBGT) is a composite temperature used to estimate the effect of temperature, humidity, and solar radiation on humans. This instrument determines true heat stress temperature by accounting for air currents, relative humidity and solar load in addition to air temperature and relative humidity making this instrument ideal for  industrial hygienists ,athletic trainers, the military and the sports medicine environment.


  • Measures:
    • Wet Bulb Globe Temperature (WBGT) -a commonly used heat stress indicator that considers the effects of temperature, humidity and radiant energy.
    • Black Globe Temperature (TG) - measured by the black globe thermometer, which monitors the effects of direct solar radiation on an exposed surface
    • Ambient Air Temperature (TA)
    • Relative Humidty (%RH)
    • IN/OUT: Represents the measuring environment that is with or without direct sun exposure and display corresponding
  • Direct measurement of radiation utilizing a brass black ball
  • Adjustable audible alarm for thermal condition monitoring
  • Audible beeper for heat stress monitoring
  • Low battery indicator
  • Can be switched between °F/°C
  • Sensor protecting cover
  • Tripod mountable
  • RS-232 output (9600 BPS, 8 data bits, no parity)
  • Auto power off (can be disabled)
  • Easy calibration for humidity
  • Heat stress index (WBGT), temperature. humidity in one handy meter


  • Air temperature range (TA): 0° to 50°C (32° to 122°F)
  • Air temperature accuracy: ±0.6°C
  • Black globe temperature range: 0° to 80°C (32° to 176°F)
  • Globe temperature accuracy:
    • Indoor:
      • ±1°C from 15 ~ 40°C
      • ±1.5°C other ranges
    • Outdoor:
      • ±2°C from 15 ~ 40°C
      • ±2.5°C other ranges
  • WBGT Temperature range: 0° to 50°C (32° to 122°F)
  • WBGT Temp accuracy: ±2°C
  • Temperature resolution: 0.1° C/F
  • WBGT values using the following equations:
    • Indoor/outdoor no sun: WBGT=0.7 WB + 0.3 TG
    • Outdoor or full sun: WBGT=0.7 WB + 0.2 TG + 0.1 TA
  • Relative Humidity range: 0 to100% RH
  • Relative Humidity accuracy:
    • ±3% RH from10 ~ 90% RH
    • ±5% RH for other ranges
  • RH resolution: 0.1 % RH
  • Response time: approximately 15 seconds
  • Operating ranges: 0°~50°C, 0~95% RH
  • Storage ranges: -20°~65°C, 0~95% RH
  • Alarm level: approximately 70dB
  • Power: (2) AAA batteries (included)
  • Battery life: Typically 250 hours (can be as much as 1000 hours without alarm condition)
  • Black ball size: 75mm diameter x height 75mm
  • Meter size: 75(H) x 75(W) x 278.2mm (L)


  • 33% Calibration standard. Relative Humidity Reference HR33LJ
  • 75% Calibration standard. Relative Humidity Reference HR75LJ
  • Windows® Software ASFT-KIT & RS-232 cable

Download Users Manual (PDF format)

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