Hi Torsha - With the advanced test, Peak Fertility is designed to stay on the display for 48 hours as described in the leaflet. A book error means the Holder has been damaged and is no longer working, typically due to urine damage or removal of the batteries. If the book symbol has appeared for no obvious reason then please keep the Holder and call your local Careline so we can arrange to retrieve it for a quality investigation - the number will be on both the box and the leaflet. Many thanks.
sally
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