You should hear a beep to indicate correct installation. If not, please reinsert the battery correctly, then close the cover.
Note
Replacing the battery does not affect the test results stored in memory, however the time and date will need to be reset.
As with all small objects, the battery should be kept away from small children as a safety precaution. If the battery is swallowed, seek medical assistance immediately.
Batteries might leak chemicals if not used for a long time. Remove the batteries if you are not going to use the device for an extended period (i.e. 3 months or more)