With 7-decades, four series dials for resistances 1, 10, 100 & 1000 ohms and 2-ratio dials. Two terminals are provided for using the series dials as an ordinary dial type resistance box. The galvanometer and battery key fitted with contacts. Range of measurement is .00W to 1,11,10000W. Coils are non-inductively wound with constantan wire. Accuracy ±0.1% B grade.