Add to Wishlist OTC 3173 Low Range Amp Probe OTC 3173 Low Range Amp Probe 19 mm clamp diameter fits most vehicles to run current drain tests, 0-20A Measurement range; 100mV/A outputAccuracy: ±1% of reading ±2mA, Resolution: 1mA, Power: Internal, replaceable 9V battery... MSRP: $979.00