The Caliper

This is the measurement tool you will use for the five physical measurements. The data will be collected in 1/1000th inch or millimeters (mm) or centimeters (cm).

Anatomical Measurements
IT IS CRITICAL THAT THESE MEASUREMENTS ARE TAKEN PRECISELY!!! A SMALL ERROR IN A BASE REFERENCE CAN GREATLY EFFECT THE ESTIMATE OF ANTLER SIZE.

• 1. Upper Nostril Width
  Labeled #1 in the above diagram: measured at the widest distance of the upper muzzle. The measurement must be on a horizontal plane (not diagonal or at an angle).
• 2. Lower Nostril Width
  Labeled #2 in the above diagram: measured at the widest distance of the lower muzzle. The measurement must be on a horizontal plane. Typically there will be a distinct start and stop point when the lower muzzle meets white hair.
  
  
  
• 3. Ear Perpendicular Width
  Shown above: the measurement should be taken at a widest INSIDE part of the ear perpendicular to the cartilage (Dashed Line). As a hint a starting point will typically be where the ear folds (see diagram above). Do not just measure the ear but the hairs also. In a 2D picture we will observe the ear with hair buffering the cartilage.
  
  
  
• 4. Eye to Eye Width
  Shown above: it is measured by placing each tip of the calipers jaw in the pre-orbital gland (shown right). Make sure that the jaws are not pushing into the pre-orbital gland but rather just touching, this ensure that we measure what we .
  
  
  
  
  would see in a 2D picture.
• 5. Eyeball Width
  Shown above: It is just the measure of the Eyeball not the entire socket or duct. The jaws of the caliper should surround the eyeball but not put pressure on the eyeball so that the size is manipulated.