A testing apparatus which is commonly known as a “fuse saver”, for testing the integrity of an electrical system of the type that utilizes flat or glass fuses, the fuse saver apparatus which includes a body portion, which includes a current receiving electrical components, a selector switch for establishing the quantity of amps for which the fuse is being tested, and a trip indicator button, which indicates the malfunctioning in the fuse contacts, an electrical cord extending from the body portion, and terminating in a plug having at least a pair of flat fuse test plugs for insertion into a flat fuse receiver, and a test plug adaptor engageable onto the flat fuse test plug, having at least a pair of cylindrical terminals, for insertion into the adaptor for glass fuses.