Heat Stress Monitor 0 Percent to 99 Percent Relative Humidity Range 4 Degrees to 122 Degrees Temp Range (F) 0 Degrees to 50 Degrees Temp Range (C) 59 Degrees to 138.2 Degrees F (15 Degrees to 59 Degrees C) Wet Bulb Temperature Range -85 Degrees to 122 Degrees F (-65 Degrees to 50 Degrees C) Dew Point Range 59 Degrees to 132 Degrees F (15 Degrees to 56 Degrees C) Wet Bulb Globe Temperature Range 4 Degrees to 353 Degrees F (0 Degrees to 80 Degrees C) Black Globe Temperature Range