This Correx force gauge is a precision instrument made by Haag-Streit and was ideal for measuring and calibrating the pressure or power to actuate fine mechanisms and spring tensions of: switches and relays; electric contacts; communication instruments; controls with adjustable friction torque; automotive parts, etc. This Correx's gauge provides readings in units of grams and in the range of ±15 gram. Haag-Streit Company was founded in the city of Bern, Switzerland, in 1858 by F. Hermann and H. Studer. Manufacturing the most accurate mechanical instrument used to measure and calibrate pressure or force.