The best practice is to have all data loggers in your fleet calibrated on an annual basis and at the same time. Having them calibrated every twelve months ensures optimal accuracy and ideal compliance. Additionally, it is possible to get a subscription for both wireless data loggers and yearly calibrations where the re-calibrated loggers are sent annually, thereby giving you complete peace of mind. A wireless data logger obsoletes the use of a USB-data logger and the process of manually having to export data.