Salter Housewares model 6055 kitchen scale, how do I replace the batteries in that? I don't know how to get the little box open that the batteries are in.

2 batteries

I went to the Salter website and I could not find that model number.
Salter Disc Electronic Digital Kitchen Scales White
However, looking at the other models they had there should be a door on the bottom of the scale. It looks like a release tab that you push in then lift up on. Give that a try.

I really hope I have found what you are looking for. Please let me know if it works. Salter 6055 Digital Kitchen Scale Replacement Battery CR2032 2 Pack eBay

"EE" means that the scale has been overloaded. Try placing a small weight (i.e. 250g block of butter) on the scale and then turning the scale off and then on again with the small weight still on the scale. What this does is to try and re-calibrate the scale. If this doesn't work then I am pretty certain that the scales will need to be replaced. The scales in question do have a 15 year guarantee and you can try contacting Salter Housewares directly if you have your proof of purchase.

https://www.pricescompare.co.uk/q&a/ee-showing-on-screen.html

i needs manuals of calibration of the scale salter model 6055

This sounds very typical of kitchen and postal scales. I know you don't want to hear this, but this basically means it is time to replace your scale with a better scale - perhaps no longer giving Salter your business..

The 1 part just slides off.

you can contact our customer service by this email address

sales@accurate-scales.com

The middle part slides out. You'll need a small knife or a screwdriver to pry it out gently.

There are openings on two sides. One side has a larger opening than the other. Make sure you pry it out of the lager opening.

Once you gently slide it out, you'll see the two batteries. Make sure the positive side is facing up when you put them back in.

Hope that helps!