Handheld oximeter with disposable probe tips

A method comprising:

• enclosing in an elongated first housing a first portion of an oximeter device, wherein a first connection interface is located at a distal end of the elongated first housing, and the first connection interface comprises a protruded portion extending in a distal direction;
• and
• enclosing in an elongated second housing a second portion of the oximeter device, wherein a second connection interface is at a proximal end of the elongated second housing, the second connection interface comprises a recessed portion extending from the proximal end of the elongated second housing in the distal direction, a sensor head is located at a distal end of the elongated second housing, and the protruded portion of the elongated first housing fits into and mates with the recessed portion of the elongated second housing, thereby facilitating removable coupling of the elongated second housing with the elongated first housing to form an exterior structure of the oximeter device,
• wherein the exterior structure of the oximeter device comprises
• a body portion comprising a front side surface and a back side surface, coupled together by first and second side surfaces,
• a tip portion of the oximeter device comprising
• a first finger rest surface, coupled to the back side surface, wherein the first finger rest surface is a surface that extends at a first angle in a first turn direction relative to the back side surface,
• a back tip surface, coupled between the first finger rest surface and a bottom face surface, wherein the back tip surface is a surface that extends at a second angle in a second turn direction relative to the first finger rest surface, and
• the bottom face surface, coupled between the back tip surface and the front side surface, wherein the bottom face surface extends at a third angle in the second turn direction relative to the first finger rest surface, and the bottom face surface comprises the sensor head,
• wherein a first line, longitudinally extending along the back side surface of the body portion, does not pass through the tip portion, and
• wherein when the oximeter device is gripped by a hand of a user, a webbing between a thumb and another finger of the user rests against the first line that extends along the back side surface.