This resistance substitution box has 11 different values 100  , 220 , 470 , 1K, 2.2K, 4.7K, 10K, 22K, 47K 100K, 220K. All values are in + 1% tolerance & all the resistance are of 1watt rating. Selection of resistance is by means of rotary switch & external connection is via 4mm socket.