Heathkit IM-58 Harmonic Distortion Meter

Distortion is evaluated in 5 ranges
	100% Full scale
	30%
	10%
	3%
	1%

Works as an AC RMS volt meter in four ranges
	1V Full Scale
	3V 
	10V
	30V

Frquency is from variable 20-200, 200-2000, and 2000-20,000hz