Final answer:
A chart holder is used to hold patient records that will be returned to the files at the end of the day.
Step-by-step explanation:
The tool used to hold patient records that will be returned to the files at the end of the day is called a chart holder. It is a device used to temporarily store patient records in a secure and organized manner. Chart holders are often placed on or near the nursing station or in a designated area to ensure easy access and efficient retrieval.