New and unused. The contents have been checked, so the item has been opened once. There is a crack in one part when opened (see photo 2). A compact device that can simultaneously measure CO2 concentration, temperature, and humidity. - Model: Compact CO2 Concentration Meter - Measurement Range: CO2 0-5000 ppm - Temperature Measurement Range: -10℃ to 50℃ - Humidity Measurement Range: 0% to 100% Thank you for viewing.