The scales of the instruments in this catalogue are conform to the DIN 43802 standards. The instruments for use by means of a C. T. Or Shunt can have interchangeable scales and are made in such a way that it is impossible to touch the indicator or damage the mechanism while the change is carried out.

The interchangeable nature of the scale has been specially designed to provide substantial advantages:

Reduction in warehouse investements. It is fact no longer necessary to store a vast assortment of instruments(eg. 40/5A, 80/5A, 300/5A etc., or 500a/60mV, 1000A/60mV, 5000A/60mV etc. )but only a few instruments without a scale and a number of loose scales evident savings in warehouse investment can be made.

Reduction in warehouse space. As it is no longer necessary to have a large assortment of complete instruments but only loose scales, it is evident that there is a considerable saving of space which is always useful in a warehouse.
Reduction in delivery time. Those who do not consider it necessary to create their own imstrument warehouse will be able to find alarge assortnent of capacities at wholesalers, agents and the central headquarters of Sfim.