Seeker

The Seeker is a Tier 5 tank that upgrades from and  at Level 60.

Design
Seeker looks identical to Aspirant with one minor difference: a small gold sphere at the end of its central barrel. It is revealed more when the tank fires and the central barrel recoils.

Technical
Uniquely, Seeker can both become invisible and see other invisible tanks. Other than that it is pretty much just an Aspirant.

Trivia

 * Seeker can be considered the Triple Shot variant of Huntress, as it upgrades from Aspirant (Triple Shot Sniper) and gains the ability to cloak itself.
 * This is one of three Radar Tanks that can also become invisible, the others being Jammer and Radar.