Zhengzhou DC power supply is probably what price, company address? [Zhengzhou] Zhengzhou Emi Emi Instrument Instrument Co., Ltd. was established in 2002, is specialized in domestic and imported high-quality electronic equipment, instrument sales and service agents operating instrumentation consists of: electronic measuring instruments, electrical instruments, power equipment, environmental testing equipment, nondestructive testing equipment, safety testing instruments Instrument Co., Ltd., Zhengzhou Megumi URL www.hm5117.cn contact: Gujingli 0371 -55,676,313 Fax 0371 -66,227,105 Business QQ: 2417674438 Address: Zhengzhou City, West Street South Street intersection (Tube City Commission southward 300 m) Product Features: 1. single-output, high accuracy, high reliability, low ripple and noise 2. 3LED digital display voltage and current values ??3 with voltage / current Coarse Fine knob precision adjustable voltage / current value of 4. constant voltage constant current mode of operation, can be automatically converted 5 with a current-limiting protection 6. high quality, affordable technical parameters: Input voltage: AC220V/110V ± 10% 50Hz / 60Hz Operating temperature: -10 ℃ -40 ℃ Relative humidity