Accuracy class 1.5, to BS89/IEC51. Ammeter till 50A are for use without shunt. Ammeter 100A (stock no. 315-9521) needs a 100A shunt (stock no. 313-788). Ammeter 300A (stock no. 315-9537) needs a 300A shunt (stock no. 313-794). Integral scales. Flame retar