Heat Index Monitor with 75 x 75mm Brass Black Ball


Heat Index Monitor with 75 x 75mm Brass Black Ball

The #WBGT8758 heat index monitor is ideal for industrial uses (such as HVAC/R) and outdoor sports medicine applications. An optional hardware/software kit turns the instrument into a data logger.


Best For:



  • Measures and displays the ambient temperature, relative humidity (RH), and the dew point and wet bulb temperatures
  • Audible alarm with adjustable setpoint
  • 33% and 75% #HR33LJ and HR75LJ reference salts are available to calibrate RH measurements in the field
  • Auto power off (can be disabled for calibration)
  • Optional #ASFTKIT PC data logging software/hardware is available
  • Tripod mount
  • NIST calibration is available
  • Specifications


    • Ambient temperature measurement range/accuracy: 32° to 122°F (0° to 50°C)/±0.8°F (±0.6°C)
    • RH measurement range/accuracy: 0 to 100%/±3% of reading from 10 to 90%RH; ±5% elsewhere in range
    • Wet bulb temperature measurement range/accuracy: 70° to 115°F (21° to 45°C)/±2°F
    • Dew point temperature measurement accuracy: ±3% of reading
    • Black ball dimensions: 2.95 (H) x 2.95 (Diameter) in. (75 x 75 mm)
    • Audible alarm setpoint range: 68° to 99°F (20° to 37°C)
    • Auto power off: After 20 minutes of inactivity
    • Power source: Two "AAA" batteries (included)


    • Batteries
    • 1-year limited warranty


    • 11 x 3 x 3 in. (278 x 75 x 75mm)