Fluke I410 AC/DC Current Clamp (400A AC or DC). Allows multimeters to measure up to 400A AC or DC. Current Range: 1A to 400A AC / DC. Basic Accuracy DC or 45Hz to 400Hz: +/- (3.5% of reading +0.5A). Output Signal: 1mV/A AC/DC. Frequency Range: 45Hz to 400Hz. Bandwidth: 3kHz. Working Voltage: 600V AC rms. Maximum Conductor Size: one 30 cm (1.18") or two 25mm (0.98") diameter. Safety Rating: EN61010, CAT III 600V.