Why is it blank, faint, or giving erratic readings? L Why is it blank, faint, or giving erratic readings? Check the batteries, they may need replacing. If still receiving errors after battery replacement, remove the batteries, press all the buttons-one at a time, and put the batteries back in. Post navigationPrevious post: Why does my product screen display LLL.LL?Next post: What are Hi/Lo alarms? Leave a Reply Cancel replyYou must be logged in to post a comment.