Manufactured by Fossil, Relic brand watches provide timepieces every bit as reliable as those offered by more expensive brands, but at a price the average Joe can afford. Relic pressure seals most of its watch cases to make them water-resistant. While water-resistance is a valuable feature in a watch, it can make removing the watch's back cover difficult. With the proper tools, some elbow grease and a bit of patience, you'll have the case of your Relic watch open in no time.

Use an optical-sized Philips screwdriver to remove any screws that secure your Relic watch's back cover. Set the screws aside until you are ready to replace them. Note that not all Relic watch models use screws to hold the back cover.

Insert an optical-sized flathead screwdriver under one of the notches on the back of your watch. Twist the screwdriver back and forth to gently pry off the watch's back.

Insert the tips of a pair of needle-nose pliers into two of the notches on the back of your watch. Squeeze the handles of the needle-nose pliers while twisting the watch clockwise. The back cover should easily separate from the watch.

Adjust the tips on a three-tip watch case opening tool so that they align with three of the notches on the back of your watch. Insert the tips of the case opening tool into the appropriate notches. Tighten your grip on the tool while turning the watch clockwise. The back cover of the watch should pop free from the rest of the watch case.