This hunting style caliper from Tru-Fire is adjustable for distance between trigger and strap and has no trigger travel.

Features include:

• The X-Caliper has two exclusive features: a trigger that can be fired by pulling or relaxing your finger and ultra-wide high strength jaws for speed of string loading
• The comfortable leather V-strap fits all sizes both right and left hands
• The extra strength no-gap jaws will not be damaged by nock points which contribute to string failure
• The X-Caliper will rotate 360 degree behind the trigger