The AEMC Instruments 400D Series Digital FlexProbes are True RMS AC current measurement tools designed for accurate measurements and easy access in confined spaces. Available with a 6" sensor, these probes measure from 20 mA to 4000 A (model dependent) and are rated for 600V CAT IV safety. All models feature auto-ranging, a HOLD function, and direct reading on a 4000-count display for clear, reliable results.