probe; probing needle
General term for a physical probe used in measurement, testing, or sensing, such as electric, magnetic, or sonic probes.
この装置には高感度の探針が使われている。
This device uses a highly sensitive probe.
探
Medical use: a slender instrument for exploring a wound, cavity, or duct.
Touch the probe to the circuit to measure the voltage.
The doctor used a probe to examine the depth of the wound.