Features:  High-precision 4-digit LED display of current, voltage and power, intuitive and clear.  Using MCU computer control, the output is more accurate and the functions are diverse.  Coded switch step adjustment: voltage and current settings make the settings more accurate and flexible.  Store and recall 2 sets of current and voltage.  Multiple protection functions: over-current (with buzzer alarm), over-voltage, over-temperature, and overload.  Intelligent temperature control fan, environmental protection and energy saving, extend fan life and reduce noise.  USB communication interface, support Modbus protocol.  Exquisite plastic panel, small size and portable, stable output and high cost performance.  Applicable to lab, research, DIY engineering, factory, repair, product aging such as resistor, capacitor, DC motor, LED, etc.    Specifications:  Plug: UK  Model: LW-305EC/ LW-3010EC (Optional)  Output Current: 0-5A (LW-305EC); 0-10A (LW-3010EC)  Output Voltage: 0-30V  Power Effect: Voltage ≤0.2%, Current ≤0.2%  Load Effect: Voltage ≤0.25%, Current ≤0.25%  Ripple: Voltage ≤30mV rms, Current ≤20mA rms (LW-305EC)  Ripple: Voltage ≤30mV rms, Current ≤25mA rms (LW-3010EC)  Output Resolution: Voltage 0.01V, Current 0.001A (LW-305EC)  Output Resolution: Voltage 0.01V, Current 0.01A (LW-3010EC)  Operating Environment:  --Altitude ≤2000m  --Ambient Temperature: -10~40℃  --Relative Humidity: ≤80%  Storage Environment:  --Ambient Temperature: -40~85℃  --Relative Humidity: ≤80%  Input Power: 50/60Hz, AC 220V/110V±10%  Interface: USB  Item Size: Approx. 215 * 151 * 70mm / 8.46 * 5.94 * 2.76in  Item Weight: Approx. 1412g / 3.11lbs  Package Size: Approx. 31 * 19.2 * 11cm / 12.20 * 7.56 * 4.33in  Package Weight: Approx. 1865g / 4.11lbs    Package List:  1 * DC Power Supply