RadioShack&reg; True-RMS Digital Clamp-on Multimeter Has a 3 3/4 digit LCD display Range: DC voltage 400mV/4V/40V/400V/600V, AC voltage 4V/40V/400V/600V True RMS, DC current 40.00A/400.0A/800A; AC current 40.00A/400.0A/800A True RMS Resistance: 400/4K/40K/400K/4M/40M ohms,Temp: -4F to 1400F (-20C to 760C) Auto-polarity and Overload indicator, low-battery indicator with Auto Power Off For indoor use only