The document provides specifications for the HTS-580 and HTS-550 series of total station instruments. The HTS-580 series offers improvements over previous models such as increased reflectorless range up to 300m, volume calculation capabilities, and dual axis compensators. It has a large LCD, ergonomic keyboard, and supports 50 graphical points, line joining, and various data transfer options including Bluetooth. The HTS-550 is more basic but still offers reflectorless measurement and features simple operation for a variety of surveying tasks. Both series provide accurate angle, distance, and coordinate measurements for professional surveying work.