The Klein Tools ET600 Insulation Resistance Tester is a handheld digital multimeter designed for measuring resistance and AC voltage in insulation systems. With a measurement category of CAT III and CAT IV, it offers auto-ranging capabilities and data hold for accurate readings. Made by Klein Tools, a trusted brand in the industry, this unit is a reliable tool for testing and inspection in various industrial settings. The digital display and absence of leads make it a convenient and efficient option for professionals in the field.