River Song's sonic trowel

River Song used a sonic trowel on various adventures as an archaeologist, including at a Mesopotamian excavation site in 1924, (AUDIO: The Boundless Sea) and a mission to to the lost world of Lyparia. (AUDIO: Time in a Bottle) The Fourth Doctor thought River's sonic trowel was cheeky because he'd never seen her gardening before. (AUDIO: Someone I Once Knew)

River later used her trowel to stun King Hydroflax's warrior monk bodyguards, though it was ineffective against Hydroflax's robot body. The Twelfth Doctor considered the trowel "just embarrassing" and gave River a sonic screwdriver of her own. (TV: The Husbands of River Song)