Features Dual display of Carbon Dioxide (CO₂) concentrations and Relative Humidity, Temperature, Dew Point, or Wet Bulb Maintenance free NDIR (non-dispersive infrared) CO₂ sensor Audible CO₂ warning alarm when concentration level exceeds high user set point Min/Max CO₂ value recall function Includes software and cable for on-line (real-time) datalogging to a PC Automatic Baseline Calibration function Data Hold, Auto Power Off (with disable), Low battery indicator Tripod mount (tripod sold separately) Complete with six AAA batteries, USB cable, PC software, and soft case read more