This product is a high precision DC power supply, adapt single chip switch integration circuit technology, the voltage resolution is 10mV and current resolution is 1mA. LCD display with stable data indication. Rational construction and light weight enable the product reliable and easy to be carried by user. Whit a fan on the back can ensure the HY3003D To work in a suitable temperature. It is a high cost-effectiveness DC power supply for labor, factory and digital repair company.