The present invention is directed to the provision of a user-friendly system that ensures freedom for incorporating the measuring system into other equipment, reduces a conversion error associated with signal conversion, reduces the cost of an A/D converter, and allows simultaneous processing of a plurality of data. A USB transducer according to the present invention comprises: an input section which receives a measurement signal from a measuring device; a controller which converts measurement data into digital data and further converts the digital data into data ready for processing by a computer; and an output section having a USB connection terminal for outputting the data generated by the controller to the computer by using a USB cable, and for receiving a control signal from the computer.