... parts, electroplating, hardware, clocks and watches, strap, tools, optical lens, jewelry, glasses, spectacle frames and got body silicon wafer, ... . All import upset stainless steel acid and alkali resistant, attractive and durable.Characteristic: ·US Gao Qzhi the ... 170KHz, 1000KHz, the effect is better; · monofrequent, dual-frequency, three frequency adjustments, satisfies the different request. JYQX- ...