This is a Mastech digital clamp meter, model MS2001, designed for electrical measurements such as AC/DC voltage and AC current.
The device features a 2000-count digital display, a jaw opening of approximately 42mm, and includes a continuity buzzer and data hold function.
It measures AC current up to 1000 amps and AC/DC voltage up to 750V/1000V respectively, making it suitable for safe, non-invasive electrical troubleshooting.