Chosen Solution
The screw holding the battery compartment shut is so tiny and so tight I cannot open it, despite trying very small screwdriver and smallest allen key. They are all too big!
@deirdremoylan without actually seeing it or knowing the size of it I would recommend a really good tool kit something like this Mako Driver Kit - 64 Precision Bits or even this one Manta Driver Kit - 112 Bit Driver Kit With those kits you will always have the right tool for any repair.
I have a small screw driver to fit this screw, still does need t open it. Looks like new scales, but not Salter. Rubbish!
