I have one identical, only with a Sunpro label and red clip boots. Had mine for years, probably got it from Autozone and was not expensive Im certain. It’s a basic tool, you’ll do more damage to it or any other by letting the wires lay on your headers or from improper storage vs. it malfunctioning on its own due to quality. Screw the screwdriver method. How you gonna work the right side of engine or underneath?? And you also may leave burn/arc marks on perhaps your nice NOS starter relay studs trying to jump them. Proper tool and you can work both sides of car as well as underneath “solo” comfortably.