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What is TÜV?

Technische ÜberwachungsVerein

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The Technische ÜberwachungsVerein (Technical Monitoring Association) is an independant international organization specializing in evaluating the safety and quality of technology.
The TÜV is recognized worldwide for its independance, neutrality, professional expertise and strict standards. 

ZD compressors have been tested and certified by the TÜV as per ISO 8573-1 class zero.