A clamp meter is an electrical test tool that combines a basic digital multimeter with a current sensor

1: Current-sensing jaw.

2: Tactile barrier (to protect fingers from shocks).

3: Hold button: Freezes the display reading. Reading is released when button is pushed a second time.

4: Dial (aka rotary switch).

5: Display.

6: Backlight button.

7: Min Max button: On first push, display shows maximum input. On subsequent pushes, minimum and average inputs are shown. Works in current, voltage and frequency modes.

8: Inrush current button.

9: Zero button (yellow): Removes dc offset from dc current measurements. Also serves as dial’s shift button to select yellow functions scattered around the dial.

10: Jaw release lever.

11: Alignment marks: To meet accuracy specifications, a conductor must be aligned with these marks.
Common input jack.

12: Volts/ohm input jack.

13: Input for flexible current probe