Possible Clues:

• It's used to examine the ear
• It's used to examine ears
• Checks out The Hearing with old Count briefly where there's capacity
• Good books on primarily terms of reference used by one involved in hearing cases?
• Nothing to connect half the Scotch to exercise that checks sound equipment
• Instrument for examining the ear
• How a mixture of soot may manage to deal with one's ear
• Good books on top Garda in southeast - the one investigating what's going on along the canal
• Lug instrument and books round room
• Ear examination instrument