OR. What It Means: There may be a problem with the test strip. For example, it may have been damaged or moved during testing. What To Do: If you tested in a normal or warm environment, repeat the test with a new test strip. OneTouch® Ultra®2 - Preparing For A Test Notes And Cautions. What to do if the meter shows an "Er4" error message? When the meter display screen shows an error message "Er4", it could.
Posted by u/qsaboutmylife915 - 1 vote and 3 comments. From glucose meters to test strips and more, get support for our full range of OneTouch ® products.