Datel / Murata´s ACM20 Series of Four-Function AC Power Meters display the most critical measurements in mains-powered equipment: voltage, amperage, active power (watts), and power factor. A front panel selector-switch provides two modes of operation: a fixed reading or continuous auto-cycling. All Datel / Murata ACM20 AC Power Meters include built-in current transformers - no other user-supplied components are required. The miniature units are packaged in a one-piece, vibration resistant, polycarbonate housing that can be installed in vertical "0U" and "1U" rack spaces. Perfect for UPS power sources, power strips, laboratory instrumentation, alternate energy applications, and any other products that require precise monitoring of AC power.