1The measurement is displayed on a high definition screen, small and light design, it is an instrument to measure gas leakage. 2Widely be used in home, office, enterprise, government, school and car, etc. 3Detect and control air problems at any time to ensure the health of family members or employees. 4Can measure the temperature and humidity, support a variety of industrial temperature measurement. 5With sound and display alarm, when the test result exceeds the safe value, the instrument will automatically alarm. 6Rapid measurement, updated every 2s, more accurate and rapid measurement of carbon dioxide concentration to ensure safety. Condition: 100% Item Type: Gas Detector Material: Plastic+ Electronic Measurement Range: 0-9999ppm Resolution: 1ppm Precision: (40+3%) PPM Single Response Time: 2s Stored Data: 100 Sensor: for Senseair S8 Operating temperature: 0-50 Working Humidity: 0%-85%RH Storage Temperature: -10-60 Preheating Time: 8s Power Supply: 31.5VAAA Battery (not included) Automatic Backlight: 30s Alarm Prompt: Sound + Display Size: Approx. 185 x 63.5 x 27mm / 7.3 x 2.5 x 1in Weight: Approx. 646g / 22.8oz 1 x Gas Detector 1 x InstructionPlease allow 1-3cm error due to manual measurement. Thanks for your understanding.