(Wikipedia excerpt: …”…A data logger (DL) (also (DL) or (D) recorder) is an electronic device that records (D) over time or about location either with a built-in instrument or sensor or via external instruments and sensors. Increasingly, but not entirely, they are based on a digital processor (or computer), and called digital (DL) . They generally are small, battery-powered, portable, and equipped with a microprocessor, internal memory for (D) storage, and sensors. Some (DL) interface with a personal computer and use software to activate the (DL) and view and analyze the collected data, while others have a local interface device (keypad, LCD) and can be used as a stand-alone device.
(DL) vary from general-purpose types for a range of measurement applications to very specific devices for measuring in one environment or application type only. It is common for general purpose types to be programmable; however, many remain as static machines with only a limited number or no changeable parameters. Electronic (DL) have replaced chart recorders in many applications…)