The Zero Kelvin Laser Diode changed the tracking laser for the nano/toxic swarmers from red to blue. The new blue laser froze enemies at a temperature of Zero Kelvin. This upgrade would only work on small-medium sized enemies and would not work on large enemies (e.g. Grunthors) or bosses.
- This weapon mod was named after Kelvin, a thermodynamic temperature scale.
- Ratchet & Clank Future: Tools of Destruction (first appearance)
- Ratchet & Clank Future: Quest for Booty