Data logger calibration involves verifying and adjusting the accuracy of data loggers—devices used to record measurements such as temperature, humidity, pressure, voltage, or other environmental and process variables over time. The calibration process includes comparing the logger’s recorded values against certified reference standards under controlled conditions, checking sensor performance, reviewing sampling accuracy, and making adjustments when necessary to correct deviations. Regular calibration ensures reliable long-term data collection, supports regulatory and quality-control requirements, prevents measurement drift, and provides traceable documentation essential for audits, compliance, and critical monitoring applications.