Add to Wishlist OTC 3174 Mid- and High-Range Amp Probe OTC 3174 High Range Amp Probe Test charging current and starting current draw. 31mm clamp diameter fits most vehicle applications. 0-200A, 0-1000A Measurement ranges; 1mV/A output, Accuracy: ±1% of reading ±500mA, Resolution:... MSRP: $322.71