What is a data logger? The generally accepted answer is that a data logger is an electronic device that autonomously records data from some type of sensor and stores it in local memory with a time and date stamp. Data loggers are widely used in virtually every industry for a variety of applications. Temperature is the most commonly measured parameter and is also the most commonly recorded parameter. There are many different types of data loggers with many different features and functions. This article will walk you through the basics of data logging technologies and what they can do for your business or organization.