Craig , do not worry about the range on the dial of the ammeter , this can be adjusted by altering the shunt , whichis like an electrical by pass . Providing you have a known steady load , and a meter to check that , then the shunt can be sorted with a file or a hacksaw , because it is really just a copper bar across the terminals in the back of the meter , which carries all but a tiny bit of the load . The meter only measures the tiny fraction of the load which does not bypass through the shunt .. If it is too small , then you add a piece of copper , a bit of water pipe will do very nicely . The face of the dial can be recalibrated fairly easily .. There are people who repair and overhaul meters .
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