Phoenix Contact PAI-4-FIX-5/6GY is a 4 mm test adapter for terminal blocks with 5.2 mm and 6.2 mm pitch. The 2.4 mm probe pin plugs into standard test sockets, allowing measurement leads to be applied to the terminal without removing the wire. The grey housing supports polarity or function coding across a row of test points in switchgear and control cabinets.