Please see the photo below for instructions on how to remove the batteries from item 14278-001.
Please note this ruler take two batteries that fit into the ruler compartment snugly. They can be installed by hand but can only be removed with a small pointed took such as an awl or paper clip.
The batteries needed for this ruler are battery number Energizer 357/303 although there are some alternative numbers that will fit this item. The replacement batteries that are found inside of the packages today are type AG13.
You can find the recommenced Energize 357/303 on Amazon in the link below :