It is used in electronics manufacturing to test assembled circuit boards (PCBAs). The board under test is placed into the fixture, and the top handle presses it down so that spring-loaded test pins (pogo pins) make contact with specific test points on the board. The buttons and small display on the front are used to operate the test procedure, while the connected wiring links the board to measurement instruments or microcontrollers that check signals, voltages, and communication functions.