Turtle tracker (IDW)

In the IDW continuity, the Turtle Tracker was a device created by Baxter Stockman to locate the Turtles, even at a distance. The item was first seen at the New World Expo, where Stockman attempted to hire Harold Lillja to find the Turtles; the device immediately located Donatello nearby. When Lillja used the device to follow his movements in the ensuing fight, Donatello smashed it.

A second Turtle Tracker was constructed shortly afterwards at Stockgen, where it was spotted by April O'Neil. She managed to steal it and stash it in the facility, and retrieved it that evening.