... harmless and pollution-free. It mainly used in metalware industry, like mobile shell, watches, jewelry etc.It is ... metal film, titanium nitride, titanium carbide, and zirconium nitride, chromium nitride and titanium, nickel, chromium, copper , and other compounds film, multi-layer ... Frequency control: 0-20 rotation per minuteMeasure modeNumber display composite vacuum gauge: from atmosphere to 1.0* ...