A Kindler is a piece of Covenant technology used to map caves and tunnels quickly and to make navigating them easier.
In 2551 a Kindler was used by a Covenant task force on Meridian to map an underground tunnel system. The Kindler ended up finding a Forerunner Luminary at the end of one of the tunnels.
A Kindler scanning the walls of a tunnel.
A Kindler producing a real-time holographic representation of a tunnel system.