If you are using WinMLS for measuring electronic equipment only, such as amplifiers, cables for connecting to the sound card is in principle all the extra equipment needed.
In order to use WinMLS for other types of measurements than electrical measurements, transducers are needed. A transducer is device for transforming a quantity to another quantity. Two well-known transducers are the microphone and the loudspeaker. A microphone transforms sound pressure to voltage and a loudspeaker transforms voltage to sound pressure.
In addition to microphones and loudspeakers, which will be discussed in more detail below, WinMLS supports transducers for calibrated measurements of the quantities displacement, velocity, acceleration and force.