Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
Princess Bubblegum's heart monitor is an invention used to find Finn, Jake and the Ice King in the episode "Lady & Peebles." The monitor reveals that Lady is pregnant by showing five smaller heart-beat signals next to Lady's signal. This is how Princess Bubblegum finds out Lady Rainicorn is pregnant. It is also used to record diary logs and provide a map of the user's current location.
The heart monitor is contained in a brown casing and has two buttons on the left side used to activate the monitor. The monitor is similar to a GPS device, displaying a graph and points representing the heartbeats detected in the vicinity.