There are a wide variety of clamp meters available from Fluke. The 330 series is the most popular and features AC/DC measurement, inrush measurement, hold function, ohms, and frequency measurement (on select versions). The 320 version can be used in AC circuits and measure resistance. The 771 milliamp process clamp meter is used to measure, test and troubleshoot 4 mA to 20 mA circuits. The 902 clamp meter is designed with HVAC applications in mind and is used in DC circuits. The 902 can measure temperature as well as display and hold functionality. The 353/355 is intended for heavy duty industrial applications and can be used in circuits to measure up to 2000A.