Our new joystick tester is the perfect tool needed for going through that old box of joysticks and figuring out what works and what doesn't. Comes completely assembled with a 3V battery. Our tester will work with all Atari 2600 compatible joysticks and will also test the second fire button on Atari 7800 joysticks or pads. Don't forget you can purchase replacement joystick domes, circuit boards, cables and boots right here at Atari Repair Parts. The BEST quality replacement parts without any of the buying hassle of other dealers!