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Upgrade your air quality monitoring with this Replacement Sensor Carbon Monoxide from Air Systems International. Made in the USA, this versatile sensor is designed for use with a range of products including CO-91, CO-91IS, CO2-91, CO2-91IS, BB50-CO, BB15-CO, BB30-CO, BB100-CO, BB30-COIS, BB50-COIS, and BB100-COIS. Featuring a condensed manufacturer number of CO91NS and model MPN of CO-91NS, this replacement sensor delivers accurate readings for detecting carbon monoxide levels in your home or workplace. With a hazardous material flag of Y, green material flag of N, country of origin of US, and CA Prop 65 Wht Label of N, this product meets safety standards while providing cost-effective maintenance for your gas detection system. Ensure the safety of your family or employees by replacing sensors regularly and keep an eye on carbon monoxide levels with ease using Air Systems International's reliable replacement sensor.