AR/CEPX FISH Probe

any of various testing devices or substances as (1)   a pointed metal tip for making electrical contact with a circuit element being checked (2)   a usually small object that is inserted into something so as to test conditions at a given point (3)   a device used to penetrate or send back information especially from outer space or a celestial body (4)   a device (as an ultrasound generator) or a substance (as radioactively labeled DNA) used to obtain specific information for diagnostic or experimental purposes