The IEC Capacitor boxes are traditional instruments that permit the selection of capacitors in decades (each dial has 10 steps). Accuracy is typically +/- 5%. This 3 dial model provides total of 11.1uF in steps of 0.01uF. Maximum voltage: 400V Dial 1: 0.01 to 0.1uF, Dial 2: 0.1 to 1.0uF, Dial 3: 1.0 to 10.0uF Connection by 4mm spin free terminals with extra terminal for earthing the housing if required.