The instrument consists of micrometer, spring, piezoresistive force sensor, reading microscope, micrometer eyepiece, and measuring instrument.
Experimental contents
☆To measure mini-elongation of spring by  micrometer;
☆To measure mini-displacement change by Hall sensor;
☆To measure mini-length by micrometer eyepiece;
☆To measure mini-elongation of spring by spring balance, and etc.