Features: brand new and high quality Capable of measuring AC/for DC up to 600 amps, This clamp adapter is built for higher current measurement. Maximum Jaw Caliber Size up to 1.57 inches (40mm), allows you to make accurate AC or for DC amperage measurement up to 600 amps without breaking the circuit. +/- 3.0%+10 accuracy for signal output conversion. The for arrow on the Jaw indicates the for DC current direction of positive current flow ( from positive to negative). 1mV per ampere output & standard 3/4 inch banana plugs makes it for most multitesters that features with 1mV sensitivity. Putting an amp-clamp on a power cord wouldn'for t get a reading, you'll need to put an amp clamp around the live wire only. Specifications: Material: Plastic Size: 17.9x9x3.6cm/ 7.1x3.5x1.4 in Jaw Caliber Size: 40mm/15.7 in Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Current Clamp Adaptor