Hoyt SG-1 Model SG-1 Dual Range 0-75/0-600 ADC Induction Amp Meter
These meters read DC amps from a wire that is placed in the slot frame on the rear of the meter case. No electrical connection is needed. The dual range meter has a 75-amp scale and a 600-amp scale. This amp meter will work with wire up to 20 gauge.