The SRA-48 is an automatic analyzer for measuring the speed of rate (modified Westergreen). Using vacuum tubes (also can be used without vacuum) of easy use to avoid any type of interference. The unit can read 48 tubes simultaneously, or make sequential readings and go loading and unloading the tubes in several series during the process. Designed and controlled by a group of expert researchers in this field. The MIX-48 is a “rotary mixer” for use in conjunction with the SRA-48. The tube with the blood sample is mixed with the special citrate to avoid clots, foam, or any other interference.