In addition to being an excellent standard of resistance, this box is particularly good for use with AC and DC bridge, Wheatstone bridges and potentiometers. Its wide range of resistance, from 0 to 1, 111, 110 ohms, makes it possible to get any value bu 1-ohm steps and its accurate to within + - 0.5 &(+ - .1 ohm). The box consists of six smooth operating rotary switches in decade sequence.