Key Durability Tester for Switches, Keyboards, and Phones - 8 Station Pneumatic Button Life Fatigue Testing Machine Product Introduction The Touch Screen Pneumatic Button Life Tester is designed for fatigue testing of switches and buttons on mobile phones, remote controls, calculators, walkie-talkies, telephones, and other electronic consumer products. This pneumatic key life testing machine uses driving cylinders with adjustable press load, cycles, and speed to simulate