Model 9114 salter scale shows Lo. I have changed the batteries but it still only shows Lo.
I had the same problem and, suspecting that the metal contacts weren't making proper contact with the batteries, I used a long nosed pliers to gently bend all ten contacts towards to the batteries (there are eight small tabs in the battery compartment, and two on the battery cover). If you don't have a long nosed pliers a small screwdriver should do it if you held the fixed part of each set of contacts so it doesn't detach during the process.
Unfortunately, it worked, but only for one weigh, and then it reverted to "Lo". This happened twice, so I telephoned the Salter Customer Service Helpline (01732 360783) who recommended a reset, which is done by removing the batteries, standing on the scale for 20 seconds, and replacing the batteries. That also only worked for one weigh, so they are looking into it further and I'll post the results here, but in the meantime I hope one of the above solutions will work for others.