What is the instrument used to detect invisible and odorless gases?

• A. Multigas detector
• B. Personal gas monitor
• C. Gas leak detector
• D. Toxic gas meter

Answer: (A)

Invisible and odorless gases can’t be sensed by humans, so you need a device that continuously measures the ambient atmosphere for multiple hazards at once. A multigas detector is designed to do just that: it combines several sensors in one portable unit to monitor common hazardous gases simultaneously—typically oxygen, a combustible gas (LEL), hydrogen sulfide, and carbon monoxide. This gives real-time readings and alarms you if any gas reaches a dangerous level, which is essential for staying safe in hazmat and confined-space situations. Other instruments might target a single gas or be specialized for leaks, so they don’t provide the broad, simultaneous coverage that a multigas detector offers.