The surface roughness measuring instrument TR100 is a pocket and portable surface roughness measuring instrument. It has the characteristics of high measurement accuracy, wide measurement range, easy operation, easy to carry, stable performance, etc. It can be widely used in the detection of metal and non-metal processing surfaces. Features, suitable for use on the production site. Working principle: Pocket-type surface roughness measuring instrument TR100, when the sensor is driven by the driving mechanism to move in a uniform linear motion along the measured surface, the inner stylus perpendicular to the working surface produces vertical displacement with the microscopic uneven contour of the working surface, and then The sensor converts the displacement change into a change in electricity, amplifies and filters the electrical signal, converts it into a digital signal by A/D, and then processes it by DSP to calculate and display the values of Ra, Rz, Rq, and Rt.