Deluxe WBGT Heat Index Monitor RH Range 5-95Pct Temp Range 32-122 Degrees F (0-50C) Wet Bulb Temp Range 70-115 Degrees F (21-45C) Dew Point Range -85 to 115 Degrees F (-65 to 46C) Wet Bulb Globe Temp Range 32-122 Degrees F (0-50C) Black Glove Temp Range 32-176 Degrees F (0-80C) Humidity Accuracy +/-3 Pct of Reading From 10-90Pct RH +/-5 Pct of Reading Elsewhere Temp Accuracy +/-0.8 Degrees F (+/-0.6C) Display LCD Battery Type (2) AAA Interface RS-232 Includes Batteries Users Manual