A sample receiving assembly capable of receiving a fluid sample from sample containers having different sizes and shapes includes an arm, an arm holder, a sample probe, and a support member, the support member having a bore therethrough and a plurality of linear grooves. The arm is disposed within the arm holder and the sample probe is disposed within the arm. The arm holder includes a hollow pivot pin insertable through the bore in the support member. The sample probe has a first portion extendable through a distal end of the arm, and a second portion extending axially through the hollow pivot pin. The plurality of linear grooves in the support member are sized and positioned to receive a guide pin on the arm and guide retraction of the arm into the arm holder from an extended position to a retracted position.