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Technology Levels are the levels of complication, danger or sophistication given to the technology in the Ben 10 series. The tech levels known thus far are 1-20, although some technology is confirmed to be higher than Level 20 (e.g. the Naljian Destructors and the Annihilargh).
Real life steam engines, internal combustion engines, nuclear fissions and wires are Level 3 and broadcasting signals and simple nanotechnology are Level 4, despite the fact that Earth is a Level 2 planet and shouldn't have any Level 3+ tech on it.[DM 2][DM 3]