The LFM-39A Wow & Flutter Meter is a direct reading type instrument designed for measurement of Wow, Flutter and Drift characteristics of tape recorders, recordplayers and other playback/recording equipment. The effective values, peak-to-peak values and center frequency (3kHz or 3.15kHz) of Wow & Flutter are indicated on the meter in accordance with J1S, CC1R, DIN, and weighted specifications. Five full scale ranges, 0.03%, 0.1%, 0.3%, 1% and 3%, are used. The use of 0.03% range makes it possible to measure accurately the Wow & Flutter characteristics of high-grade tape recorders. The LFM-39A contains an oscillator with excellent frequency accuracy, which can be used to calibrate the drift meter and supply a recording signal. Moreover, this Wow &c Flutter meter is equipped with a TO SCOPE terminal for analyzing Wow & Flutter components and a RECORDER terminal for Wow & Flutter recording.