These Decade  resistance boxes incorporate specially designed switches for precision and rapid measurement of resistance. Covering the  ranges  from 0.1 to 111,110 - Ohms. Each decade switch has 1 - 10 positions in addition to zero position. The dial assembly is mounted on a panel and enclosed in a metal / wooden box for protection from dust and acid fumes. All carbon metal film resistance values are of ± 1%  tolerance  and of  1%  watts ratings. Provided with knobs having ribs for comfortable operation with 4 mm output socket terminals.