S-500 is a portable vein finding device. It can project the blood vessels image on skin surface accurately and timely. The ergonomic design makes it very comfortable to hold. And the optional desktop stand and mobile trolley are available for multiple application situations. Help doctors and nurses easily find veins of various patients, such as obesity, hairy or dark skin people, etc. It will highly increases the success rate of puncture thus reduces the cost and pain. This device also can be used to examine patients with varicose veins, and avoid closed or bifurcated veins.