trier

/T R AY1 ER0/
noun
  1. 1

    One who tries; one who makes experiments or examines anything by a test or standard.

  2. 2

    An instrument used for sampling something.

  3. 3

    One who tries judicially.

  4. 4

    A person appointed by law to try challenges of jurors; a trior.

  5. 5

    That which tries or approves; a test.

Source: https://en.wiktionary.org/wiki/trier