LM20A function recorder, is the new AC servo single, double pen X-Y recorder, can be used for measuring , recording function relationship of X1 and Y2、Y: Y1=f(x)、Y2=f(x); X-axis time scan, achieve Y1=f(t)、Y2=f(t) function. This instrument with beautiful shape, high record accuracy, fast response, high reliability. Used for measuring and recording temperature, pressure, flow, position, speed, vibration and other physical function relationships through transmitter