Memo Book, Memo Pad, Notebook, Notepad, Scratchpad
noun
A memo (メモ) notebook is a memo book or memo pad that you use to write notes in.
めもちょう, メモちょう
The reading is the one you learned with the kanji, plus メモ.
話の途中で申し訳ありませんが、あなたのメモ帳のことでどうしても質問したいんです。
Forgive me for interrupting, but I must ask you a question about your memo pad.