Mastech HH2002 Pro Series DC/AC True-RMS Clamp-On Ammeter/Multimeter UL approved:CAT II 600V Rated 3-3/4 digil Large LCD display 4000 count with symbolic signs Auto Ranging High Voltage test up to 600V DC and 600V TRMS AC Higher Current test up to 600A AC/DC Patented ATL11 Technology: Automatic test lead warning indicator when test lead placed into incorrect port