MASTECH M266 AC Clamp Meter, which is a tool used for measuring electrical parameters. AC Current: Ranges of 200A and 1000A. AC/DC Voltage: Capable of measuring up to 1000V AC and 750V DC. Resistance: Ranges up to 2000MΩ. Power Supply: Operates on a 9V battery. Dimensions/Weight: Approximately 235mm x 96mm x 46mm with a weight of about 200g