A very fine-toothed comb used to check a person's hair for nits or lice.

plural of detection comb

A gag fashioned from a piece of cloth pulled over one’s mouth and tied at the back of one’s head.

plural of detective gag

(roofing) A device that contains a radioactive source to emit high velocity neutrons into a roof system. Reflecting neutrons are measured by a gauge that is used to detect hydrogen; the quantity of hydrogen detected may be linked to the pressure of water.

plural of nuclear hydrogen detection meter