lower tester
A computing term referring to a testing tool or method that operates at a lower level, such as hardware or low-level software testing.
This lower tester is used to verify the basic operation of the hardware.
Compound of 下位 (かい, lower rank/level), 試験 (しけん, test), and 手段 (しゅだん, means/method). The exact derivation is uncertain; it is a technical term likely coined in computing contexts.