Few tips help to find a vein with a vein finder/vein viewer machine. You need to do these activities before using the vein finder machine. First, you need to get your body warm; it helps to increase blood flow. Lie down on a bed or table and hang the arm you want to infuse; it also helps to increase blood flow. Drink lots of water; veins become more opened with a hydrated body. After this use the vein detector machine/vein finder machine. You can easily find veins now in a patient body.