A Stethoscope can be bought from Martin Thwait at the Rogue's Den. Level 50 Thieving and Agility is required to access Martin Thwait's store and purchase the item. You can also obtain the Sethoscope without 50 Agility by having 99 Theiving.
A stethoscope increases the chance of successfully cracking the Wall safes in the centre of the Rogue's Den main chamber, near Martin Thwait; or the wall safes in the Theives' Guild. A stethoscope, however, has no effect when cracking the safes in the Rogues' Den minigame itself or for any other thieving activity, with the exception of the Wall safes in the Theives' Guild.
A stethoscope has no known medicinal or health use in RuneScape, unlike on Earth.
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