What is a check terminal (checker-chip)?
Check terminals are useful for checking the operation of the prototype board in circuit design, and for adjusting and checking the electrical characteristics in the manufacturing and assembly processes. They are also called terminal post, test point, probe point or contact pin besides "checker chip".
When checking the operation of a board on which electronic components are mounted, transient operations and signals may be checked using an oscilloscope. However, holding the probe on the circuit by hand may cause the influence due to the static capacitance of the human body, and cause the noise. Also, it is not easy to keep holding the probe for a long time.
Check terminals are required to have a shape that allows the probe to be hooked and have holdability.