xtech SL510: Sound Level Meter High-Accuracy Sound Level Meter with A and C Weighting, Fast/Slow Response Modes Extech LT510: Light Meter Compact Foot-Candle/Lux Light Meter with Backlit LCD Extech EN510:10-in-1 Environmental Meter Measures Air Velocity, Air Flow, Air Temperature, Type K Temperature, Heat Index, Humidity, Wet Bulb, Dew Point, Windchill, and Light Level