The Gardner Bender GCM-500 clamp-on analog multimeter is a 4 function, 8 range manual-ranging tester engineered to measure AC Current (600A), AC/DC Voltage (600/60V), and Resistance (1000Ω). Similar to standard analog multi-meters, clamp meters offer a large range of functions with the additional unique ability to measure current without having to contact live conductors. This tester includes a 1.5 inch jaw size with the Lockjaw feature that prevents misuse by only allowing the jaws to open in the Amps mode. Unit also offers an 8 position smooth rotary dial, zero Ohms adjustment dial and a data hold switch to maintain the reading on the easy-to-read display. Unit meets cETLus agency approvals, is fuse and diode protected, and includes a calibration screw. Tester provides a 3ft drop and 150 lb. Gardner Bender offers over 50 years of experience making professional electrical testers, tools, and supplies so you can count on us to provide quality-performing products for professional and DIY use. Requires 1 AA battery (not included).