This CO2 monitor is a desktop type unit designed for fast and accurate measurement of CO2 level, air temperature, and humidity. Perfect to be used to monitor air quality in schools, office buildings, greenhouses, factories, hotels, hospitals and anywhere that high levels of carbon dioxide are generated Features: Large LCD display Simultaneous triple result complete with real-time clock & calendar 15° tilt angle NDIR (non-dispersive infrared) CO2 sensor Visible & Audible (80db) CO2 warning ABC (automatic Baseline Calibration) Longtime drift compensation Manual CO2 calibration with calibration indicator Max. & Min. function With power adaptor output voltage indicator via LCD and LED light With level indicator, indicating if CO2 level is in "good", "normal", "poor" condition Selectable °C and °F Factory pre-calibrated CE Marking Specifications: Measuring Range : CO2: 0~2000ppm 2001~9999 (out of scale) Air Temp. : -10°C~60°C (14°F~140°F) Air RH% : 0.1%RH~99.9%RH Resolution : CO2: 1ppm Air Temp.:0.1°C / 0.1°F Air RH%:0.1%RH Accuracy: CO2: 50ppm ±5% of reading Air Temp.:±0.6°C, ±0.9°F Air RH%: ±5%RH (at 25°C, 10~90% RH)/±7%RH (at 25°C, 90% RH) Response: CO2: 2 mins (90% step change) Air Temp.: 2 mins (90% step change) Air RH%: 10 mins (90% step change) Air Quality Level (CO2 Concentration): Good: 700ppm (programmable by user) Normal: 700 ~ 1000ppm (programmable by user) Poor: "Normal" Alarm: 1000ppm (programmable by user) Operating Condition: -10~50°C, 5~80%RH (Be sure to avoid condense) Storage Condition: -20~60°C, 5~90%RH (Be sure to avoid condense) LCD & Green LED Display Power Supply: Power adaptor (5V/0.5A output) Set Includes: 1 x CO2 Desktop Monitor 1 x Power adaptor 1 x English Operation Manual Standard White Packaging Box