The ACM20 Series Power Meters provide five critical measurements: True-rms AC volts, True-rms AC current, Real Power, Power factor and Line frequency. These multifunction meters also offer user-selectable display modes. Fixed reading of volts, amps, watts, power factor or hertz and continuous auto-scrolling through four measurements are available. The ACM20 also has four LED annunciators to indicate the selected measurement as well as a front panel selector switch. With a miniature surface mount package, these meters occupy minimal behind-the-panel space and can easily fit in ‘0U’ or ‘1U’ enclosures. With built-in current transformers and no other user supplied components required, they also fit existing ACA-20PC and competing power meter cutouts.