Apparatus for measuring optical characteristics including position detection

An apparatus comprising:

• a processor;
• a display coupled to the processor and displaying information to a user of the apparatus;
• at least a first optical sensor making a first measurement, wherein data based on the first measurement is coupled to the processor;
• at least a second optical sensor making a second measurement, wherein data based on the second measurement is coupled to the processor;
• at least one source of illumination operating in the IR range of illumination under control of the processor;
• wherein the source of illumination and the first optical sensor in part determine a minimal distance between the apparatus and an external object such that illumination in the IR range emitted by the source is not received by the first optical sensor when the apparatus is less than the minimal distance from the external object;
• wherein data based on the first measurement made with the first optical sensor determines a position of the apparatus with respect to an object;
• wherein the second measurement with the second optical sensor measures light received by the apparatus.