![REED Instruments R9910SD Natural Gas, Carbon Monoxide & Refrigerant Detectors; Detector Type: Air Quality Meter ; Display Type: 4-Digit LCD; Dual Display ; Function: Measures Oxygen (O2), Carbon Dioxide (CO2), Carbon Monoxide (CO), Temperature & Humi REED Instruments R9910SD Natural Gas, Carbon Monoxide & Refrigerant Detectors; Detector Type: Air Quality Meter ; Display Type: 4-Digit LCD; Dual Display ; Function: Measures Oxygen (O2), Carbon Dioxide (CO2), Carbon Monoxide (CO), Temperature & Humi](https://cdn11.bigcommerce.com/s-rerso7mgzy/images/stencil/640x640/products/1436383/1533680/1016728-21__88754.1719300929.jpg?c=1)
REED Instruments R9910SD Natural Gas, Carbon Monoxide & Refrigerant Detectors; Detector Type: Air Quality Meter ; Display Type: 4-Digit LCD; Dual Display ; Function: Measures Oxygen (O2), Carbon Dioxide (CO2), Carbon Monoxide (CO), Temperature & Humi