Gas-detection monitors and tools check for gases in an area to find leaks and help prevent exposure to hazardous gases. Single-gas and multi-gas detectors are portable devices commonly used for inspecting tanks and pipelines. Single-gas detection tubes contain granules that change color when exposed to a specific compound, making them ideal for spot testing. Fixed gas detectors provide continuously monitoring of a specific area. Automated gas detector test systems maintain calibration and track data for a compatible gas detector. Calibration gas is used for testing the sensitivity of gas detectors. Gas-detection control panels manage multiple gas sensors, communicate the status of a detection system, and set limits for activating alarms and warnings.