From the time of its invention to this day, laser interferometer is one of the crucial instruments in dimensional metrology. Given its great configuration flexibility, this device makes it possible to measure a wide variety of dimensional features such as length, straightness and small angles, as well as a lot of other dimensional features. Through scientific research there is a common need for adjustment of measuring systems to the specific requirements of the task, such as measurement of small displacements with great precision or measurement of large displacements with lower žprecision. With no commercial open-source systems available, the need for development of a custom specified laser interferometer system appeared. The interferometer system was developed with the requirements of the Laboratory for precise measurement of length at the Faculty of Mechanical Engineering and Naval Architecture in mind. In this paper, the research of modular laser interferometer started in „Development of a modular laser displacement interferometer“ was continued. Mechanical setup of the developed interferometer system was designed using Thorlabs components. In contrast to the previous experiments, the source of the light was changed and replaced with He-Ne Lasertex laser, which offered better frequency stability. Upgrades implemented on system for detection and count of interference fringes enabled movements of the variable position mirror utilizing significantly higher speeds. The usage of simulation software Tina TI has considerably accelerated electronic system development process. In the experimental part of this paper experiments on individual parts, as well as experiments on assembled electronic circuits were performed. The experimental part was completed with testing of the assembled version of the laser interferometer prototype. Developed prototype has the ability to detect the direction and the amount of displacement, which was tested on lengths up to 180 mm with speeds up to 600 mm/s.