A fume hood monitor is a device used to measure the performance of a fume hood. It is designed to detect and measure the air flow rate, velocity, and volume of air being exhausted from the hood. The monitor is typically placed in the exhaust duct of the fume hood and measures the air flow rate and velocity of the air being exhausted. It also measures the total volume of air exhausted from the hood over a given period of time. This data is then used to determine the effectiveness of the fume hood in controlling hazardous fumes and vapors. The monitor can also be used to detect any leaks in the fume hood, which can be dangerous if not addressed. The monitor is an important tool for maintaining a safe and healthy work environment, as it can help identify potential problems with the fume hood before they become a hazard.