The MD 9231 is a TRMS AC and DC clamp meter designed for industrial applications, featuring a large jaw opening and suitable for measuring currents up to 1000 A. Key features include capacitance and frequency measurement. The built-in VFD function allows for measuring true values in accordance with frequency. The MD 9231 offers a wide range of additional functions, including data and MAX hold functions, automatic shutdown, automatic range selection, and a relative zero function. It utilizes state-of-the-art measurement technology and is housed in a durable industrial-grade casing. It also includes a flashlight for working in dark environments.