Hi: I have a TI Converter calculator and as you probably know is quite old , but it does the capacity,length,temp,weight immediately , but recently , when I push a digit , two or three may show up on screen , what may I do to correct this , I don't want to part with it because it is the easiest one I have seen , apparently the battery is not the cause of this . Please advise . Thanks George Spencer Until next time, George & Jacque