Multi-recorder TMR-300 series is a compact multi-channel data acquisition system capable of combining measurement units for inputting various sensors according to the purpose of measurement. Due to its compact size and light weight, the system can be easily installed not only on existing structures such as machines and bridges in which the installation space is restricted, but also on moving bodies such as automobiles, aircrafts and ships. One control unit and ten measurement units can be connected together and placed in a small space, or each measurement unit can be distributed in the vicinity of the sensors to be measured.