Carbon Dioxide Gas Detector Handheld Indoor Household Air CO2 Concentration Alarms 1. Measuring range: 0-9999ppm 2. Resolution: 1ppm 3. Accuracy: +-(40+3%) ppm 4. Single response time: 2s 5. Data storage: 100 records 6. Sensor: Senseair S8 7. Working temperature: 0-50 degrees Celsius 8. Working humidity: 0%-85%RH 9. Storage humidity: -40 - 70 degrees Celsius 10. Warm-up time: 8s 11. Automatic backlight off: 30s 12. Alarm prompt: sound + display 13. Power supply: 3 x 1.5V AAA batteries (not included) 14. Size: about 18.5 x 6.35 x 2.7cm 15. Weight: about 172g Features: 1. Temperature and humidity measurement, support for a variety of industrial temperature measurement 2. Fast measurement, 2stime real-time refresh 3. When the carbon dioxidetemperature and humidity exceed the set alarm value, the machine will automatically flash the alarm and emit a beeping alarm sound 4. Can store 100 sets of measurement data including carbon dioxide concentration and temperature and humidity 5. Safety protection, no fear of environmental challenges, dustproof and waterproof