The Honeywell Analytics S3Kcal Calibration Cap is a specialized accessory used to support accurate calibration of compatible gas detection sensors. It works by fitting securely over the sensor and creating a controlled environment for applying calibration gas, allowing the detector to verify and adjust its response. Designed for use with Honeywell Analytics gas detection equipment ins... https://www.partshnc.com/s3kcal-honeywell-analytics-calibration-cap