Livestock weight estimation device

A caliper for taking the dimension of an object comprising first and second straight elongated parallel members assembled together for relative longitudinal movement, an object engaging abutment secured to one end of said first member and a pair of caliper arms pivotally carried by said one end of said first member on each side of said abutment for closing movement towards each other transversely of said first member from an open limit position to an object engaging position in which the spacing between the outer end portions of said caliper arms is equal to said dimension, link devices connecting said second member to said caliper arms to cause said closing movement upon manually moving said second member relative to said first member towards said abutment, graduations marked along second member and a cursor carried by said second member, said graduations and cursor being relatively displaced upon movement of said second member relative to said first member, said link devices include a pair of caliper arm extensions respectively secured at their inner end to the respective caliper arms extending away from said abutment along each side of said members and flaring outwardly at their free end portions and a spreader secured to said second member and slidably engaging said caliper arm extensions to cause their spreading and consequent closing movement of said caliper arms upon said movement of said second member towards said abutment.