Abstract: A measurement system includes an enclosure having at least one sidewall defining an interior space and at least one opening in the at least one sidewall, and a male insert configured to be coupled to the at least one sidewall of the enclosure. The male insert includes a flange configured to engage an exterior surface of the at least one sidewall around the opening, a stem configured to extend through the opening and into the interior space, and a central opening. The measurement system also includes a female insert configured to be detachably coupled to the male insert inside the interior space, and an opto-electronic sensor configured to be housed inside central opening along the stem of the male insert. The measurement system defines a substantially unobstructed viewport for the opto-electronic sensor.