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The WanpTek series high precision DC power supply is specially designed for scientific research, product development, laboratories, schools and electronic production lines. WanpTek DC power supply could be used for electro etching. The output voltage and current are continuously adjustable at nominal value. Featuring high accuracy, reliability, perfect overload and short circuit protection circuit, they can be an ideal choice for the industry. Operating conditions: Dual Input voltage: AC 110V/220V±10% (switch selection 115V in United States), 50Hz/60Hz Operating environment: 32 - 104°F (0 - 40°C), and humidity: ≤90% Storage environment: temperature: 4°F-140°F(-20°C~60°C), and humidity: ≤80% Specifications: - Output voltage: DC 0-30V Continuous adjustable - Output DC Current: 0V - 5A - Overall efficiency: ≥89% - Display resolution: voltage: 0.1V , current 0.01A - Voltage and Current adjustment - Voltage regulation: CV 0.1% + 3mV, CC < 0.5% + 6 mA - Protection: High current limiting and cooling fan - Load stabilization: CV 0.5% +1mV / CC 0.5% +3mA - Ripple and noises: ≤ 0.5%V P-P - Cooling way: Intelligent temperature control fan. - Dimension: 8.8x 3.2x 6.5 Inch - Unit Weight: 3.2pounds What You Get: Power supply host x 1 Output power cord x 1 Input power cord x 1 User manual x 1 Notice: Do not operate in humid environment Do not operate in flammable and explosive environment Keep the product surface clean and dry It has a switch to flip between 110v and 220v (when 220v,you get 24v max , and when 110v, you will get 30v) The unit was set to 220VAC input so the output voltage (when powered w/ 120VAC) was mucked up. Make sure to check it and if you are in the USA (or as applicable) set it to 120VAC.