Compatible with many lab scopes and graphing multimeters. Use to generate current waveforms for diagnostic analysis. Also works great with digital multimeters. Jaw opening of 1/2" clamps over most negative battery cables. Low battery indication, auto power-off Great tool for accurate measurement of low current. Use with your graphing meter or lab scope to view current waveforms on fuel injectors, fuel pumps, primary ignition coils and more. Also works very well with digital multimeters. Resolution of 10 milliamps is low enough for most parasitic drain testing. In addition, the clamp opening of 1/2" is large enough to clamp over most negative battery cables for those parasitic drain tests. Best for automotive, marine, small engine, HVAC and industrial technicians. Test ranges: DC amps - 0-20A, 0-80A (resolution: 01A); AC amps - 0-20A, 0-80A (resolution: 01A).