Decade Resistance Box is a high-accuracy & stable DC variable resistor with 6 dials. They feature low voltage coefficient variation of the resistance value less than ±0.1% at 1 M?, shock & vibration-proof construction, easy-to-read in-line indication. It is suited for calibration of insulation resistance testers and bridges. These resistance boxes are used in combination with voltage or current standards to adjust voltage or current as dummy load resistances or as an arm of AC bridges. The decade resistance boxes use 11-position switches to select any resistance value, which is read directly by the knob settings. These resistance boxes use rugged rotary switches in low contact resistance and scratch proof anodized printed front panel.