M9813 is a miniature, high-precision transducer module manufactured by Microtran, Inc. It is a miniature, digital transducer that is used to measure and record very small physical changes in the environment, such as vibrations, rotational speed, and position. The M9813 module has a range of 1 to 40,000 Hz, and is highly accurate, with an accuracy of better than 0.04%. It also has sample rate selectable from 2ms to 8s, and features a variety of output formats including 0-4V, NPN, and PNP. The M9813 also has a built in circular buffer and temperature compensation, making it ideal for applications that require high accuracy and flexibility.