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If you have HPS305D, which means you have got a variable & slim DC power supply. It is a utility instrument suitable for both Lab and industrial use, now more and more DIY maker's must 3rd-hand. It comes with high definition dual 3 digital display, has maximum output voltage of up to 30 volts and current up to 5 amps. It comes with rotary switches for setting up the voltage and current(make sure it is 110V on my back). With its reliability & versatility, invaluable and indispensable tool for testing, science project and etc., ideal for labs, computure and smart phone maintance, research institutes, R & D facilities. You can set CV and CC by pushing the Buttons, easy and stable. Specifications: Ø Single-channel output Ø CC/CV auto switchable Ø 110V/220V Switchable Ø Over-load protection function. Ø Overheated protection function. Ø short circuit protection function. Ø Coarse/ fine tune the Voltage and Current Ø Nice cooling with temperature-controlled fan Ø 3 digital LED-display for voltage and current Ø Small body, light weight ,only 1.4KG ,easy for carry Ø Good performance with excellent cost effective Technical indicators: *Input voltage AC 110V/220V,50/60Hz *Output voltage 0 ~ Nominal value *Output current 0 ~ Nominal value *Voltage resolution 10/100mV *Current resolution 1/10mA *Power effect CV≤1%+10mV *Effect of load CV≤1%+10mV *Ripple and noise Vp-p≤1% *Voltage display precision ±1%+1digits *Current display precision ±1%+2digits *Net/gross Weight (KG) 1.4KG *Dimension (mm): 81W×165H×220L Package 8pcs/conton(bulk order) Standard Package Contents: ->Power supply×1 ->Power cord×1 ->Test Leads×1 ->Uswer manual ×1 Solid HPS305D, Your review sharing will be beneficial to other friends! Many thanks !