If you change watch batteries, you will appreciate this kit. It has everything needed to do the job quickly in a convenient roll-and-tie pouch.
Items included in kit:

1.00mm Straight Blade Screwdriver

Spring Bar Tool

Plastic Tweezers (for handling batteries)

Scratch Brush (for cleaning battery cavity)

Screw-Back Case Opening Wrench

1.20mm Phillips Screwdriver

Bench Knife (for pop-off case backs)