What three components needed to be widespread for the modern, small, battery-powered digital temperature logger to emerge?

Miniaturized, stable electronic sensors, low-power microprocessors, and non-volatile digital memory

The true digital temperature logger that is compact and portable is a product of the later digital revolution, relying on advancements in solid-state electronics from the latter half of the 20th century. The device required miniaturized, stable sensors (like thermistors or robust thermocouples) capable of outputting reliable electrical data. Secondly, it needed low-power microprocessors capable of handling timing, indexing data points, and managing storage efficiently without draining the battery quickly. Finally, non-volatile digital memory was essential so that data would be retained even if the device lost power or was moved, allowing for later transfer to a computer for analysis.