Product Features: Measures AC Current up to 300A in two ranges Easy to read with 3 3/4 digit (4000 count) backlit display Autoranging and simple two-button operation Shock absorbing case provides impact and drop resistance Overload protection helps resist damage from transient overvoltages CAT II 300V certified and double insulated Data Hold button conveniently freezes readings Powered by 3V battery for up to 100 hours Auto power off function for extending battery life Dimensions: 5.8 x 1.8 x 0.8 in.