General Technologies Corp CM1000 - 1000 A 25.4 millimeters

GTC 1000 Amps AC/DC current clamp meter is equipped with auto-range and high current measurement capability and allows the measurement of AC/DC currents with a resolution down to 0.1 A, and up to a maximum of 1000A, making it ideal for testing all kinds of loads such as found in electric motors, fuel pumps, charging systems, starter currents, alternators, etc. This features a small and narrow jaw, which can accept cables up to 1 inch (25.4mm) in diameter and be used in confined spaces, wire bundles, and small gauge wires. Other features includes resistance measurement functions, continuity test (with buzzer), and display hold and peak detector functions.