Have trouble keeping track of the small screw when changing the battery on your IP54 Digital Caliper? Fear not! We have a 'care package' for those in need. It includes one screw for the battery cover, one smaller screw for the thumb roller (just in case that one is taken out and lost by mistake when changing the battery), a small screwdriver and a CR2032 battery. Directions for changing the battery are included. Free shipping included.