Manual test LID is a component of a chip test socket, typically used for manually operated chip testing. Its function is to apply appropriate pressure to the chip through manual operation, securing the chip in the precise position to ensure optimal contact between the chip pins and the socket's probes or spring contacts. This prevents any displacement of the chip during testing, which could compromise the accuracy of the test results. Some LID are equipped with heatsinks that can help dissipate heat from the chip.